<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:2f067c12-5a91-478f-8ffe-baf367e9d250,g:efbb77f8-e7dd-44c6-bd5f-9c49d1c59db3-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.evercommerce.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="evcm-20211231.xsd#ConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/ConsolidatedBalanceSheets" xlink:type="extended" id="ibbb86bac921f4acab465c263c31d0ea6_ConsolidatedBalanceSheets">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_ceb02cce-4f8d-4421-acd5-e6b1ffefd4f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_e16170a8-644e-4287-ad03-98965862ba9e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ceb02cce-4f8d-4421-acd5-e6b1ffefd4f2" xlink:to="loc_us-gaap_AssetsAbstract_e16170a8-644e-4287-ad03-98965862ba9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_e16170a8-644e-4287-ad03-98965862ba9e" xlink:to="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_fd550f44-fa3b-40b4-8b08-cb0cd17aeb63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_fd550f44-fa3b-40b4-8b08-cb0cd17aeb63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashCurrent_40f4d0c7-501b-433c-87f8-07b8e989f57e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:to="loc_us-gaap_RestrictedCashCurrent_40f4d0c7-501b-433c-87f8-07b8e989f57e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_14f53ecc-a532-40a6-ab03-e6655d22a9ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_14f53ecc-a532-40a6-ab03-e6655d22a9ce" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_8b58af8c-92a3-4cfe-9830-fba0e8bdd531" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_8b58af8c-92a3-4cfe-9830-fba0e8bdd531" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_0adfeb2e-6db4-4e58-8897-53c704cd7e64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_0adfeb2e-6db4-4e58-8897-53c704cd7e64" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_51b3e1ba-e70d-4637-a4c7-d763a4d3d74a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_19a3e86b-caa7-4ee0-9a78-1cd15efffb98" xlink:to="loc_us-gaap_AssetsCurrent_51b3e1ba-e70d-4637-a4c7-d763a4d3d74a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_e16170a8-644e-4287-ad03-98965862ba9e" xlink:to="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_7a5a57b6-e755-4f66-b3a7-e434eef7fce1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_7a5a57b6-e755-4f66-b3a7-e434eef7fce1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_afdf69c4-6bd2-4ee5-b1d4-18eb38602b21" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_afdf69c4-6bd2-4ee5-b1d4-18eb38602b21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_11e9c06d-6885-45a4-9068-b40eeb5d0f63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_11e9c06d-6885-45a4-9068-b40eeb5d0f63" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_5351033a-938b-412c-9165-e1784f01d280" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_5351033a-938b-412c-9165-e1784f01d280" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_f05e52c6-11f1-4e0b-ac0b-f4ab9c63813d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:to="loc_us-gaap_Goodwill_f05e52c6-11f1-4e0b-ac0b-f4ab9c63813d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrent_9bd2dc8e-6771-42d2-8b37-a700330f7e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_55813d40-1348-4399-9457-ccdd797b37b4" xlink:to="loc_us-gaap_AssetsNoncurrent_9bd2dc8e-6771-42d2-8b37-a700330f7e4b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_6ffa0035-593e-4c4b-aa49-fbc5b6ace13c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_e16170a8-644e-4287-ad03-98965862ba9e" xlink:to="loc_us-gaap_Assets_6ffa0035-593e-4c4b-aa49-fbc5b6ace13c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_ceb02cce-4f8d-4421-acd5-e6b1ffefd4f2" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_c32dc74a-063e-4f89-9307-e1f37cc453e1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:to="loc_us-gaap_AccountsPayableCurrent_c32dc74a-063e-4f89-9307-e1f37cc453e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_224c6df0-9920-47e6-8d93-f32ff7fac522" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_224c6df0-9920-47e6-8d93-f32ff7fac522" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_3c9f6d1e-ec05-4765-afa1-ce7b6b5f01c7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_3c9f6d1e-ec05-4765-afa1-ce7b6b5f01c7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerRefundLiabilityCurrent_09f48208-ef5b-4b3d-8e49-703d2afd8f6f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerRefundLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:to="loc_us-gaap_ContractWithCustomerRefundLiabilityCurrent_09f48208-ef5b-4b3d-8e49-703d2afd8f6f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_df9bb8cb-99cb-4f6a-a631-4afbaf94005d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:to="loc_us-gaap_LongTermDebtCurrent_df9bb8cb-99cb-4f6a-a631-4afbaf94005d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_ff59b585-17c2-4a88-8b8c-ad792c594454" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_ecf432a2-dc44-4d82-b393-68756e125175" xlink:to="loc_us-gaap_LiabilitiesCurrent_ff59b585-17c2-4a88-8b8c-ad792c594454" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_4003a2e6-f758-43f3-8881-17b72afd0293" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_4003a2e6-f758-43f3-8881-17b72afd0293" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_cbcc83c3-225a-426e-aded-963695d83d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_cbcc83c3-225a-426e-aded-963695d83d2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_8029c5ae-34c6-47f5-8bbd-1983baed8da5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_8029c5ae-34c6-47f5-8bbd-1983baed8da5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_a74acfdd-5d8c-4d53-a142-59c1477ee955" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_a74acfdd-5d8c-4d53-a142-59c1477ee955" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_3bfa08f5-167f-47e3-8bc6-1775a55b25ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_3bfa08f5-167f-47e3-8bc6-1775a55b25ad" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_e6ce1cce-f5f0-4488-b0fc-17e832271ae3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_6995432d-21de-4878-9bea-3591f154910d" xlink:to="loc_us-gaap_Liabilities_e6ce1cce-f5f0-4488-b0fc-17e832271ae3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_bf2cd0a8-bc83-4673-b67b-7e43451ce9cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:to="loc_us-gaap_CommitmentsAndContingencies_bf2cd0a8-bc83-4673-b67b-7e43451ce9cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityAbstract_da09de59-ec18-482c-81b5-0706f940ce4a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:to="loc_us-gaap_TemporaryEquityAbstract_da09de59-ec18-482c-81b5-0706f940ce4a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_7e97413e-cc3c-46e6-83bb-77ff4fd3a552" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityAbstract_da09de59-ec18-482c-81b5-0706f940ce4a" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_7e97413e-cc3c-46e6-83bb-77ff4fd3a552" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:to="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_5a2efd2d-7a5b-47fe-bd3f-65f81cf35116" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:to="loc_us-gaap_PreferredStockValue_5a2efd2d-7a5b-47fe-bd3f-65f81cf35116" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_066cff81-5d33-45f5-bb07-0f373e41ca64" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:to="loc_us-gaap_CommonStockValue_066cff81-5d33-45f5-bb07-0f373e41ca64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_1f94cf01-2b68-4397-8bfd-0db3fb5c7f09" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_1f94cf01-2b68-4397-8bfd-0db3fb5c7f09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_785aa186-c9a9-47ae-b6bb-b6cb6dd1cf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:to="loc_us-gaap_AdditionalPaidInCapital_785aa186-c9a9-47ae-b6bb-b6cb6dd1cf1d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_9cfe2f8d-e4de-4251-b6bf-d01e62f6ec49" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_9cfe2f8d-e4de-4251-b6bf-d01e62f6ec49" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_0131ef33-4bc9-4588-a831-d83969f9f41a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_68a6c674-38de-487e-a83e-d3fcec166fdd" xlink:to="loc_us-gaap_StockholdersEquity_0131ef33-4bc9-4588-a831-d83969f9f41a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_83ffc514-bbd2-4129-9a21-2f094bd1e2fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_bdb05b33-061b-4eba-80c4-b2eab9dcf70c" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_83ffc514-bbd2-4129-9a21-2f094bd1e2fd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_483814d6-526a-4b14-b33b-36c7b9cc0c76" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_ceb02cce-4f8d-4421-acd5-e6b1ffefd4f2" xlink:to="loc_us-gaap_StatementTable_483814d6-526a-4b14-b33b-36c7b9cc0c76" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_643612e3-c260-43e1-8718-e180f5ab83ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_483814d6-526a-4b14-b33b-36c7b9cc0c76" xlink:to="loc_us-gaap_StatementClassOfStockAxis_643612e3-c260-43e1-8718-e180f5ab83ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_643612e3-c260-43e1-8718-e180f5ab83ce_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_643612e3-c260-43e1-8718-e180f5ab83ce" xlink:to="loc_us-gaap_ClassOfStockDomain_643612e3-c260-43e1-8718-e180f5ab83ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c26e5de3-65a0-4760-88d0-c1838535d4fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_643612e3-c260-43e1-8718-e180f5ab83ce" xlink:to="loc_us-gaap_ClassOfStockDomain_c26e5de3-65a0-4760-88d0-c1838535d4fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesBConvertiblePreferredStockMember_6a8c6b6f-2a30-496d-b6d4-a439809869b1" xlink:href="evcm-20211231.xsd#evcm_SeriesBConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c26e5de3-65a0-4760-88d0-c1838535d4fa" xlink:to="loc_evcm_SeriesBConvertiblePreferredStockMember_6a8c6b6f-2a30-496d-b6d4-a439809869b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesAConvertiblePreferredStockMember_4fdc550c-3e03-4bc7-90e3-d9ee7c7c5880" xlink:href="evcm-20211231.xsd#evcm_SeriesAConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c26e5de3-65a0-4760-88d0-c1838535d4fa" xlink:to="loc_evcm_SeriesAConvertiblePreferredStockMember_4fdc550c-3e03-4bc7-90e3-d9ee7c7c5880" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="evcm-20211231.xsd#ConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" id="i9dc6abbfd189482ea409afc0ce5e3b19_ConsolidatedBalanceSheetsParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_d8cd7246-7e83-4eef-b404-3c96b882ab92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_d8cd7246-7e83-4eef-b404-3c96b882ab92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_81c5b11b-2895-466c-922f-2be7f6841659" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_81c5b11b-2895-466c-922f-2be7f6841659" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesAuthorized_a6089bad-a7e7-4e9e-b007-ab77fc6e50b7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_TemporaryEquitySharesAuthorized_a6089bad-a7e7-4e9e-b007-ab77fc6e50b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesIssued_85d7afa4-ceda-4ade-a3ec-d39827d283e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_TemporaryEquitySharesIssued_85d7afa4-ceda-4ade-a3ec-d39827d283e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_821f698a-3b0c-42db-9a27-5fa4de51df3b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_821f698a-3b0c-42db-9a27-5fa4de51df3b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityLiquidationPreference_a160358f-d981-4005-9955-3be96c0ee277" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_TemporaryEquityLiquidationPreference_a160358f-d981-4005-9955-3be96c0ee277" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_1183bfe6-0de8-452c-a608-5f52d5087c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_1183bfe6-0de8-452c-a608-5f52d5087c0e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_d1ee8616-52e2-4b5e-a595-c1a76b9ed85e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_d1ee8616-52e2-4b5e-a595-c1a76b9ed85e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_fff75002-b28e-4e5c-8657-c896d29d0350" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_PreferredStockSharesIssued_fff75002-b28e-4e5c-8657-c896d29d0350" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_11da1029-6405-4268-8bb4-cf6e9d9a4091" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_11da1029-6405-4268-8bb4-cf6e9d9a4091" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_7e72eaf4-dd68-44a6-901e-548c696b5f10" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_7e72eaf4-dd68-44a6-901e-548c696b5f10" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_2353be9b-ab87-486e-a562-d99ece051cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_2353be9b-ab87-486e-a562-d99ece051cb2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_fd9c0cca-60dd-4d63-b4d7-65a6fa814bbb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_CommonStockSharesIssued_fd9c0cca-60dd-4d63-b4d7-65a6fa814bbb" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_79cd10bb-d658-4d76-9ca3-841e58239f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_79cd10bb-d658-4d76-9ca3-841e58239f2b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_d7030271-1b4d-4fb3-9380-a291da837232" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_fff3eae4-82db-44ec-acdb-b05e0fca7e0d" xlink:to="loc_us-gaap_StatementTable_d7030271-1b4d-4fb3-9380-a291da837232" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_74282ac8-9f09-4002-94c9-4d97043e3e83" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_d7030271-1b4d-4fb3-9380-a291da837232" xlink:to="loc_us-gaap_StatementClassOfStockAxis_74282ac8-9f09-4002-94c9-4d97043e3e83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_74282ac8-9f09-4002-94c9-4d97043e3e83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_74282ac8-9f09-4002-94c9-4d97043e3e83" xlink:to="loc_us-gaap_ClassOfStockDomain_74282ac8-9f09-4002-94c9-4d97043e3e83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_6c94477f-9e3f-4baa-bc78-6d8494a9aebb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_74282ac8-9f09-4002-94c9-4d97043e3e83" xlink:to="loc_us-gaap_ClassOfStockDomain_6c94477f-9e3f-4baa-bc78-6d8494a9aebb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesBConvertiblePreferredStockMember_12298df0-9863-4cf6-a907-64910f1849f9" xlink:href="evcm-20211231.xsd#evcm_SeriesBConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_6c94477f-9e3f-4baa-bc78-6d8494a9aebb" xlink:to="loc_evcm_SeriesBConvertiblePreferredStockMember_12298df0-9863-4cf6-a907-64910f1849f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesAConvertiblePreferredStockMember_6ea494b0-aa8d-4a48-ab30-4024b768a9e3" xlink:href="evcm-20211231.xsd#evcm_SeriesAConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_6c94477f-9e3f-4baa-bc78-6d8494a9aebb" xlink:to="loc_evcm_SeriesAConvertiblePreferredStockMember_6ea494b0-aa8d-4a48-ab30-4024b768a9e3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/ConsolidatedStatementsofOperationsandComprehensiveLoss" xlink:type="simple" xlink:href="evcm-20211231.xsd#ConsolidatedStatementsofOperationsandComprehensiveLoss"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/ConsolidatedStatementsofOperationsandComprehensiveLoss" xlink:type="extended" id="ic2d4fbf816be4c839d22c1c5009c495f_ConsolidatedStatementsofOperationsandComprehensiveLoss">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_4d4ea75f-88c8-443b-ba62-32e876f88461" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_RevenuesAbstract_4d4ea75f-88c8-443b-ba62-32e876f88461" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f870f024-3b0c-4552-97c4-17ac7feff42a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_4d4ea75f-88c8-443b-ba62-32e876f88461" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_f870f024-3b0c-4552-97c4-17ac7feff42a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_57cbce69-45aa-441e-9bbd-8ec8829307d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_57cbce69-45aa-441e-9bbd-8ec8829307d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_e790f349-e66e-4ea6-a9a5-a01958765380" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:to="loc_us-gaap_SellingAndMarketingExpense_e790f349-e66e-4ea6-a9a5-a01958765380" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_aee3bb19-5a34-4f5e-a81b-9e49140ed860" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_aee3bb19-5a34-4f5e-a81b-9e49140ed860" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_cd86098e-fdf9-4d7f-af8e-5488a8a35153" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_cd86098e-fdf9-4d7f-af8e-5488a8a35153" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_c547be39-e688-4472-aad2-6cea1cdbef9a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_c547be39-e688-4472-aad2-6cea1cdbef9a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_0e642dfa-8fb0-4ca5-9713-0e980afe19c8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_b8bac0f1-b185-4d3c-85fe-d2f59f93e090" xlink:to="loc_us-gaap_CostsAndExpenses_0e642dfa-8fb0-4ca5-9713-0e980afe19c8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_a49d9b5c-bcb3-41dc-8011-09c1646bcfe3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_OperatingIncomeLoss_a49d9b5c-bcb3-41dc-8011-09c1646bcfe3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_d3367d04-662d-48cf-b424-68d650087077" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_d3367d04-662d-48cf-b424-68d650087077" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_4a24e7b6-9b5e-4ce3-8e27-c5b19201ba38" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_4a24e7b6-9b5e-4ce3-8e27-c5b19201ba38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_9bd8fa6d-a098-4d5f-83b6-b82506e9f770" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_9bd8fa6d-a098-4d5f-83b6-b82506e9f770" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_8565387a-85eb-4164-83fe-5726b8351eff" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_8565387a-85eb-4164-83fe-5726b8351eff" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_42e220ad-0a2e-4978-880c-63faf9781b69" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_NetIncomeLoss_42e220ad-0a2e-4978-880c-63faf9781b69" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_87ac7ec5-2ac0-44ac-84fa-eda017d6b9ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_87ac7ec5-2ac0-44ac-84fa-eda017d6b9ef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_c845c57c-a74f-4270-a0eb-a60431cb9284" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_87ac7ec5-2ac0-44ac-84fa-eda017d6b9ef" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_c845c57c-a74f-4270-a0eb-a60431cb9284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_3c802e26-782e-4788-b41b-23b1aae9c82f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_3c802e26-782e-4788-b41b-23b1aae9c82f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_db64e7bd-adfa-4f9e-aa2a-f9756e747789" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_db64e7bd-adfa-4f9e-aa2a-f9756e747789" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_39485964-0675-4db9-b83a-9546656c6760" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsAndOtherAdjustments_cab38ac6-5d77-4b0a-9010-d504a4842f74" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockDividendsAndOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_db64e7bd-adfa-4f9e-aa2a-f9756e747789" xlink:to="loc_us-gaap_PreferredStockDividendsAndOtherAdjustments_cab38ac6-5d77-4b0a-9010-d504a4842f74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_ae9a20d7-d4d9-49ce-9bc5-0567adf0e3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_db64e7bd-adfa-4f9e-aa2a-f9756e747789" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_ae9a20d7-d4d9-49ce-9bc5-0567adf0e3e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_730d26df-8d14-4e43-a1d7-e850f85f894d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_db64e7bd-adfa-4f9e-aa2a-f9756e747789" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_730d26df-8d14-4e43-a1d7-e850f85f894d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_c41f4c3d-50b6-4a2f-a1a8-fe75a9830603" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_EarningsPerShareBasic_c41f4c3d-50b6-4a2f-a1a8-fe75a9830603" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_e7d3d04f-fb95-4d3a-96ed-3266e8d2dcb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_EarningsPerShareDiluted_e7d3d04f-fb95-4d3a-96ed-3266e8d2dcb2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a661061b-b027-4555-bc0a-b6cf0213a494" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_a661061b-b027-4555-bc0a-b6cf0213a494" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a2fd10a9-4fb2-46a0-a332-3612af80feeb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a2fd10a9-4fb2-46a0-a332-3612af80feeb" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_8f701b69-4961-48d5-88b4-6431cccf1a6c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1b639511-1723-4f57-8025-1c94ddd88c0e" xlink:to="loc_us-gaap_StatementTable_8f701b69-4961-48d5-88b4-6431cccf1a6c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_c05b8a85-d049-43f9-8765-8582ee20c971" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_8f701b69-4961-48d5-88b4-6431cccf1a6c" xlink:to="loc_srt_ProductOrServiceAxis_c05b8a85-d049-43f9-8765-8582ee20c971" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_c05b8a85-d049-43f9-8765-8582ee20c971_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_c05b8a85-d049-43f9-8765-8582ee20c971" xlink:to="loc_srt_ProductsAndServicesDomain_c05b8a85-d049-43f9-8765-8582ee20c971_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_90f3159e-8685-45dd-a01a-d0864c3c250f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_c05b8a85-d049-43f9-8765-8582ee20c971" xlink:to="loc_srt_ProductsAndServicesDomain_90f3159e-8685-45dd-a01a-d0864c3c250f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LicenseAndServiceMember_88836960-ac0e-4ec8-8a30-3cd195f1615a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LicenseAndServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_90f3159e-8685-45dd-a01a-d0864c3c250f" xlink:to="loc_us-gaap_LicenseAndServiceMember_88836960-ac0e-4ec8-8a30-3cd195f1615a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_MarketingTechnologySolutionsMember_5c79e725-b654-4112-a5c3-b0445f9bb2b1" xlink:href="evcm-20211231.xsd#evcm_MarketingTechnologySolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_90f3159e-8685-45dd-a01a-d0864c3c250f" xlink:to="loc_evcm_MarketingTechnologySolutionsMember_5c79e725-b654-4112-a5c3-b0445f9bb2b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_OtherRevenueMember_39c58bb4-69ec-4da0-8427-08cd3fc9c502" xlink:href="evcm-20211231.xsd#evcm_OtherRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_90f3159e-8685-45dd-a01a-d0864c3c250f" xlink:to="loc_evcm_OtherRevenueMember_39c58bb4-69ec-4da0-8427-08cd3fc9c502" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/ConsolidatedStatementsofConvertiblePreferredStockandStockholdersDeficit" xlink:type="simple" xlink:href="evcm-20211231.xsd#ConsolidatedStatementsofConvertiblePreferredStockandStockholdersDeficit"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/ConsolidatedStatementsofConvertiblePreferredStockandStockholdersDeficit" xlink:type="extended" id="i0657e59dbb3d4a9d8b6a5522e742c61b_ConsolidatedStatementsofConvertiblePreferredStockandStockholdersDeficit">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_eabbc8e5-c857-4760-b19d-5ea2a3f57988" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_eabbc8e5-c857-4760-b19d-5ea2a3f57988" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_f1c4e242-8512-4d31-a3e8-dfb0ade04e18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_f1c4e242-8512-4d31-a3e8-dfb0ade04e18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_93d4dd7a-a873-418c-972c-3aa715599f46" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_93d4dd7a-a873-418c-972c-3aa715599f46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_48b22072-a07f-4cda-8082-4a126e00bc43" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_evcm_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_48b22072-a07f-4cda-8082-4a126e00bc43" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_cb562da3-44b7-4faa-8f9a-2a168c9e1893" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_cb562da3-44b7-4faa-8f9a-2a168c9e1893" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityStockIssuedIssuanceCosts_911058ec-ee77-4b5c-a3ea-c1e4d209e830" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityStockIssuedIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_evcm_TemporaryEquityStockIssuedIssuanceCosts_911058ec-ee77-4b5c-a3ea-c1e4d209e830" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquitySharesConversionOfConvertibleSecurities_91318042-bf32-4f80-8bc4-94ef40a21152" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquitySharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_evcm_TemporaryEquitySharesConversionOfConvertibleSecurities_91318042-bf32-4f80-8bc4-94ef40a21152" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityValueConversionOfConvertibleSecurities_fd105740-aaf0-4e0a-bd6a-0d95fd09cd13" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_evcm_TemporaryEquityValueConversionOfConvertibleSecurities_fd105740-aaf0-4e0a-bd6a-0d95fd09cd13" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquitySharesConversionOfCommonStock_28d346f1-54fd-41ed-a911-1f1b3d6f110e" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquitySharesConversionOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_evcm_TemporaryEquitySharesConversionOfCommonStock_28d346f1-54fd-41ed-a911-1f1b3d6f110e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityValueConversionOfCommonStock_6ee252e3-261d-47ff-8258-192defd936ff" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityValueConversionOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_evcm_TemporaryEquityValueConversionOfCommonStock_6ee252e3-261d-47ff-8258-192defd936ff" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityAccretionToRedemptionValue_5843d11c-403f-4f56-90c1-b2e998105c17" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityAccretionToRedemptionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_e878dd34-c659-414d-b69e-d006603f97ad" xlink:to="loc_us-gaap_TemporaryEquityAccretionToRedemptionValue_5843d11c-403f-4f56-90c1-b2e998105c17" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_6d60271b-5d03-40a6-828e-9b74b7da7333" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_f3f9a1e3-d179-4b90-9c58-91f2f1a34c28" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_eabbc8e5-c857-4760-b19d-5ea2a3f57988" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_642b810a-2a00-4479-baa4-9e8400a7e6fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_SharesOutstanding_642b810a-2a00-4479-baa4-9e8400a7e6fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_0fb30a6d-133c-4b64-b8f8-fc08bd8622c6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockholdersEquity_0fb30a6d-133c-4b64-b8f8-fc08bd8622c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_083dfe7f-5f71-4e65-8dab-69ea915dde8a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_083dfe7f-5f71-4e65-8dab-69ea915dde8a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_a5faf8ca-cee5-43b6-9244-71a2866e413b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_a5faf8ca-cee5-43b6-9244-71a2866e413b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_11a061eb-b55f-4a73-b6e3-c7dee88d3f71" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_11a061eb-b55f-4a73-b6e3-c7dee88d3f71" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesConverted1_40c72abd-f3bb-4488-bba7-e5f68aec4ad7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConversionOfStockSharesConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_ConversionOfStockSharesConverted1_40c72abd-f3bb-4488-bba7-e5f68aec4ad7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockAmountConverted1_ec825e07-a91f-4643-aa6d-55a8495f9127" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConversionOfStockAmountConverted1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_ConversionOfStockAmountConverted1_ec825e07-a91f-4643-aa6d-55a8495f9127" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_1dda8ad1-cdb9-4118-aa5b-5cdebda1b004" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_1dda8ad1-cdb9-4118-aa5b-5cdebda1b004" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_b02eb081-ce2d-44c1-8fcf-8043e667848f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_b02eb081-ce2d-44c1-8fcf-8043e667848f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_c473bd48-5684-40ed-9fd2-2cd5f05e6d35" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures_c473bd48-5684-40ed-9fd2-2cd5f05e6d35" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_3a6a7fd8-b6cc-4937-a626-f57f3fefc17d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_3a6a7fd8-b6cc-4937-a626-f57f3fefc17d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_e89b3a69-1ded-4bfb-abc9-4d1789fe5c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_e89b3a69-1ded-4bfb-abc9-4d1789fe5c7c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_6b726ecc-5a61-49bf-b298-ec02b8e87bfb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_6b726ecc-5a61-49bf-b298-ec02b8e87bfb" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_2084955a-25be-44dd-aec0-b900a2d58aef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_2084955a-25be-44dd-aec0-b900a2d58aef" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_77b5df1e-7a2d-490b-89b8-e04178459fc9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_77b5df1e-7a2d-490b-89b8-e04178459fc9" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_bcc1f0d2-347a-44ba-b849-77a9e895d50e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_bcc1f0d2-347a-44ba-b849-77a9e895d50e" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_6983ce89-73a6-4be4-a6c8-c0e920981ba1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_6983ce89-73a6-4be4-a6c8-c0e920981ba1" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_49c87256-bc55-4143-a47c-3c20bca9c438" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_NetIncomeLoss_49c87256-bc55-4143-a47c-3c20bca9c438" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_d304d8ba-7c75-4f22-b222-db72ae0ff973" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_d304d8ba-7c75-4f22-b222-db72ae0ff973" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_2a47f716-6213-422d-9dd2-a93dc1a3f11c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_2a47f716-6213-422d-9dd2-a93dc1a3f11c" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_StockIssuedDuringPeriodSharesPreferredPlacement_bdc7006b-7fd9-4f31-859c-b4c04c3d9ed3" xlink:href="evcm-20211231.xsd#evcm_StockIssuedDuringPeriodSharesPreferredPlacement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_evcm_StockIssuedDuringPeriodSharesPreferredPlacement_bdc7006b-7fd9-4f31-859c-b4c04c3d9ed3" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_StockIssuedDuringPeriodValuePreferredPlacement_c0a2cd80-83fb-428b-a8b7-36e63376526c" xlink:href="evcm-20211231.xsd#evcm_StockIssuedDuringPeriodValuePreferredPlacement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_evcm_StockIssuedDuringPeriodValuePreferredPlacement_c0a2cd80-83fb-428b-a8b7-36e63376526c" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AdjustmentsToAdditionalPaidInCapitalReleaseOfNetOperatingLossValuationAllowance_4a666a04-f94c-42bb-9598-deb0dda58cd5" xlink:href="evcm-20211231.xsd#evcm_AdjustmentsToAdditionalPaidInCapitalReleaseOfNetOperatingLossValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1dca666c-a62a-417c-91f0-f9511d9f90e6" xlink:to="loc_evcm_AdjustmentsToAdditionalPaidInCapitalReleaseOfNetOperatingLossValuationAllowance_4a666a04-f94c-42bb-9598-deb0dda58cd5" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_023cd507-65e3-432e-95f6-8799a5f474c9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_9f13ee73-1fa0-48d5-b1bd-1d4bec96b22f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_fb3dc14f-a555-40b9-8e56-0c19b40343de" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_eabbc8e5-c857-4760-b19d-5ea2a3f57988" xlink:to="loc_us-gaap_StatementTable_fb3dc14f-a555-40b9-8e56-0c19b40343de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_b1506bd8-9ba0-4383-943d-14934133d453" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_fb3dc14f-a555-40b9-8e56-0c19b40343de" xlink:to="loc_us-gaap_StatementClassOfStockAxis_b1506bd8-9ba0-4383-943d-14934133d453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_b1506bd8-9ba0-4383-943d-14934133d453_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_b1506bd8-9ba0-4383-943d-14934133d453" xlink:to="loc_us-gaap_ClassOfStockDomain_b1506bd8-9ba0-4383-943d-14934133d453_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_06ddd11d-a678-410c-9746-1db1f55f3350" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_b1506bd8-9ba0-4383-943d-14934133d453" xlink:to="loc_us-gaap_ClassOfStockDomain_06ddd11d-a678-410c-9746-1db1f55f3350" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertiblePreferredStockMember_cf632e72-bb5c-4bc3-a158-29037c8ab76a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_06ddd11d-a678-410c-9746-1db1f55f3350" xlink:to="loc_us-gaap_ConvertiblePreferredStockMember_cf632e72-bb5c-4bc3-a158-29037c8ab76a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesBConvertiblePreferredStockMember_bf1aa8ba-7e21-4684-b464-609649d44e67" xlink:href="evcm-20211231.xsd#evcm_SeriesBConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConvertiblePreferredStockMember_cf632e72-bb5c-4bc3-a158-29037c8ab76a" xlink:to="loc_evcm_SeriesBConvertiblePreferredStockMember_bf1aa8ba-7e21-4684-b464-609649d44e67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesCConvertiblePreferredStockMember_15f30201-0b2a-4172-afee-f79c3846c901" xlink:href="evcm-20211231.xsd#evcm_SeriesCConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConvertiblePreferredStockMember_cf632e72-bb5c-4bc3-a158-29037c8ab76a" xlink:to="loc_evcm_SeriesCConvertiblePreferredStockMember_15f30201-0b2a-4172-afee-f79c3846c901" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesAConvertiblePreferredStockMember_6ad3e7df-8ea0-4281-bf23-9fb2654b108a" xlink:href="evcm-20211231.xsd#evcm_SeriesAConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConvertiblePreferredStockMember_cf632e72-bb5c-4bc3-a158-29037c8ab76a" xlink:to="loc_evcm_SeriesAConvertiblePreferredStockMember_6ad3e7df-8ea0-4281-bf23-9fb2654b108a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_dea6ccb4-568d-4492-8cb4-7039b3dc8cc4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_fb3dc14f-a555-40b9-8e56-0c19b40343de" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_dea6ccb4-568d-4492-8cb4-7039b3dc8cc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_dea6ccb4-568d-4492-8cb4-7039b3dc8cc4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dea6ccb4-568d-4492-8cb4-7039b3dc8cc4" xlink:to="loc_us-gaap_EquityComponentDomain_dea6ccb4-568d-4492-8cb4-7039b3dc8cc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f737183c-2138-40ea-8401-1a70d67639a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_dea6ccb4-568d-4492-8cb4-7039b3dc8cc4" xlink:to="loc_us-gaap_EquityComponentDomain_f737183c-2138-40ea-8401-1a70d67639a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_d26b9575-916b-4314-9287-574f752facf5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f737183c-2138-40ea-8401-1a70d67639a7" xlink:to="loc_us-gaap_PreferredStockMember_d26b9575-916b-4314-9287-574f752facf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_c0d28626-e916-407e-a601-a0f971916889" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f737183c-2138-40ea-8401-1a70d67639a7" xlink:to="loc_us-gaap_CommonStockMember_c0d28626-e916-407e-a601-a0f971916889" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_8c2a3f33-f19b-4e68-a88b-1a3c3b5b3973" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f737183c-2138-40ea-8401-1a70d67639a7" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_8c2a3f33-f19b-4e68-a88b-1a3c3b5b3973" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_e9d633e9-eb5c-4b78-98b6-9658d3d4f68b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f737183c-2138-40ea-8401-1a70d67639a7" xlink:to="loc_us-gaap_RetainedEarningsMember_e9d633e9-eb5c-4b78-98b6-9658d3d4f68b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4c6cbb79-f083-4b35-8104-8512e45ecb19" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f737183c-2138-40ea-8401-1a70d67639a7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_4c6cbb79-f083-4b35-8104-8512e45ecb19" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="evcm-20211231.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended" id="ic910fd3d22234de3be1a799392c70d66_ConsolidatedStatementsofCashFlows">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9c3eeae8-177b-4b6c-a05c-e97e22936aad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9c3eeae8-177b-4b6c-a05c-e97e22936aad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_6a15ab1b-ba43-4802-932e-60098c814ba1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9c3eeae8-177b-4b6c-a05c-e97e22936aad" xlink:to="loc_us-gaap_NetIncomeLoss_6a15ab1b-ba43-4802-932e-60098c814ba1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_9c3eeae8-177b-4b6c-a05c-e97e22936aad" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_GainLossOnExtinguishmentOfDebtExcludingAmountNotAddedBackToNetIncome_00ac9f35-4c5b-4735-ac03-606d251367c5" xlink:href="evcm-20211231.xsd#evcm_GainLossOnExtinguishmentOfDebtExcludingAmountNotAddedBackToNetIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_evcm_GainLossOnExtinguishmentOfDebtExcludingAmountNotAddedBackToNetIncome_00ac9f35-4c5b-4735-ac03-606d251367c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_7401a93d-f3be-40e8-b2e1-6f1924d8d0f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_7401a93d-f3be-40e8-b2e1-6f1924d8d0f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareImpairments1_282d311f-85d8-494c-a505-debf23b39db1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedComputerSoftwareImpairments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareImpairments1_282d311f-85d8-494c-a505-debf23b39db1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_b6669dff-f90e-432d-b9f6-10ea3fb8492e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_b6669dff-f90e-432d-b9f6-10ea3fb8492e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCosts_c9e627a8-6f47-434b-bcca-54473418fb5f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AmortizationOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_AmortizationOfFinancingCosts_c9e627a8-6f47-434b-bcca-54473418fb5f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_165a7feb-ffdf-4a6f-ae7b-d905e85eaa83" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_165a7feb-ffdf-4a6f-ae7b-d905e85eaa83" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_0991e829-bacd-4069-82e9-81a5b0751920" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_0991e829-bacd-4069-82e9-81a5b0751920" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaidInKindInterest_d8ef8e45-425e-4ff2-abd1-6543a3f1ab10" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaidInKindInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_PaidInKindInterest_d8ef8e45-425e-4ff2-abd1-6543a3f1ab10" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_e711187a-1446-4740-a65f-aae21173392d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_ShareBasedCompensation_e711187a-1446-4740-a65f-aae21173392d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_910f3451-fbca-4296-8969-e3d8ffcb4102" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_910f3451-fbca-4296-8969-e3d8ffcb4102" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_0b5b7bd9-f092-46bb-b530-cb12f2bf4972" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_0b5b7bd9-f092-46bb-b530-cb12f2bf4972" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_f9ee139b-ae71-4f22-a02f-71f640117d9c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_f9ee139b-ae71-4f22-a02f-71f640117d9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_0f77a2b9-0777-4a7a-a324-869712b6667b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_0f77a2b9-0777-4a7a-a324-869712b6667b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_d24523e2-20d4-4a75-a438-f101abf32d52" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_d24523e2-20d4-4a75-a438-f101abf32d52" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_7d2a0866-df3f-40a6-a2ff-6bb13b47622f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_7d2a0866-df3f-40a6-a2ff-6bb13b47622f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_11ff8f98-078d-4c00-948c-3bd6395de211" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_9f429403-12f3-4d1b-9273-b02603b1cd6d" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingLiabilities_11ff8f98-078d-4c00-948c-3bd6395de211" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_dfed6e25-6913-4715-8d04-bccf851dcada" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_63c5ffb7-4270-4d66-b119-9fee0938ed8b" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_dfed6e25-6913-4715-8d04-bccf851dcada" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_fb97514f-9b8e-4f2c-aa3e-3312150eb5bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_fb97514f-9b8e-4f2c-aa3e-3312150eb5bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_25ec8da4-b5cd-49a3-9737-00356e015dd8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_fb97514f-9b8e-4f2c-aa3e-3312150eb5bf" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_25ec8da4-b5cd-49a3-9737-00356e015dd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForSoftware_855034b0-be6b-483a-886a-04e999e5c303" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForSoftware"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_fb97514f-9b8e-4f2c-aa3e-3312150eb5bf" xlink:to="loc_us-gaap_PaymentsForSoftware_855034b0-be6b-483a-886a-04e999e5c303" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities_a9677c1c-f9d2-4b0d-b386-b43090cf3c7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_fb97514f-9b8e-4f2c-aa3e-3312150eb5bf" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityInvestingActivities_a9677c1c-f9d2-4b0d-b386-b43090cf3c7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_17b4843d-3d53-48f7-83b3-4bcffb826d34" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_fb97514f-9b8e-4f2c-aa3e-3312150eb5bf" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_17b4843d-3d53-48f7-83b3-4bcffb826d34" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4038eb49-04d7-4bbd-b2f8-3d739f12bbbd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_fb97514f-9b8e-4f2c-aa3e-3312150eb5bf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_4038eb49-04d7-4bbd-b2f8-3d739f12bbbd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_17b78d33-463e-4a4b-9172-102fc8d53403" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_17b78d33-463e-4a4b-9172-102fc8d53403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_cc08f67b-aefe-4dc2-8c7f-8556d8cd3795" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_cc08f67b-aefe-4dc2-8c7f-8556d8cd3795" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_d529e0e1-ad25-4299-988d-8cc664e14fdd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_d529e0e1-ad25-4299-988d-8cc664e14fdd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_7b35f1e1-58d9-4bd3-9f91-4c20313f13c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_7b35f1e1-58d9-4bd3-9f91-4c20313f13c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock_93d827bc-96ea-4d82-9807-07ef922b50a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock_93d827bc-96ea-4d82-9807-07ef922b50a2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_8e8b8956-4212-4596-8f68-86f901b45cec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_8e8b8956-4212-4596-8f68-86f901b45cec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_3b5b9b70-eaac-4bcb-ad00-c22fe8fa48c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_3b5b9b70-eaac-4bcb-ad00-c22fe8fa48c5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0f6406ec-8f3a-4301-8d84-c5a518d641cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_8e8a9c60-2c30-4383-9b37-c59a9be86dcf" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_0f6406ec-8f3a-4301-8d84-c5a518d641cc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_844a6263-1d2b-4ca0-9e0a-e5af330cee8c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_844a6263-1d2b-4ca0-9e0a-e5af330cee8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8fafc9cf-b984-4dad-a87a-519c244ea3b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_8fafc9cf-b984-4dad-a87a-519c244ea3b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectAbstract_463b64c0-9922-4cbf-8717-edb2d6d259bf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectAbstract_463b64c0-9922-4cbf-8717-edb2d6d259bf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_322718f3-97aa-4b43-a971-095b1f67418b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffectAbstract_463b64c0-9922-4cbf-8717-edb2d6d259bf" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_322718f3-97aa-4b43-a971-095b1f67418b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_a86ce777-c879-42b5-82c2-6db7b19b435b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_fd7d1bfe-4310-48d8-9d05-9040c4ff6fdc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_fd7d1bfe-4310-48d8-9d05-9040c4ff6fdc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_7cd5a892-0a4f-486b-9190-ba63728b49d9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_fd7d1bfe-4310-48d8-9d05-9040c4ff6fdc" xlink:to="loc_us-gaap_InterestPaidNet_7cd5a892-0a4f-486b-9190-ba63728b49d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_c623b402-f11c-453c-bdb4-f9fcb4d4513a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_fd7d1bfe-4310-48d8-9d05-9040c4ff6fdc" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_c623b402-f11c-453c-bdb4-f9fcb4d4513a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_c6e04787-0591-49f4-afdc-1acceda492e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_c6e04787-0591-49f4-afdc-1acceda492e5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_bad8f347-1368-4744-8c98-656674fb46a2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_c6e04787-0591-49f4-afdc-1acceda492e5" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_bad8f347-1368-4744-8c98-656674fb46a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_7b7fee68-e8ae-4b57-a5fd-22e41a7bf2dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_c6e04787-0591-49f4-afdc-1acceda492e5" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_7b7fee68-e8ae-4b57-a5fd-22e41a7bf2dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityAccretionToRedemptionValue_96084311-1a8c-45e1-b43c-75fff746f078" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityAccretionToRedemptionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_c6e04787-0591-49f4-afdc-1acceda492e5" xlink:to="loc_us-gaap_TemporaryEquityAccretionToRedemptionValue_96084311-1a8c-45e1-b43c-75fff746f078" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_c5c44e8c-4ea4-4106-97c6-c0370dffa68c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_c6e04787-0591-49f4-afdc-1acceda492e5" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_c5c44e8c-4ea4-4106-97c6-c0370dffa68c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_da9aa078-692e-4a61-ae9c-ae3d9a7cb577" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_f6a46dc4-7497-48be-aeed-e09f66a47996" xlink:to="loc_us-gaap_StatementTable_da9aa078-692e-4a61-ae9c-ae3d9a7cb577" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_b6f96b46-b253-455c-b4e2-1c1268937481" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_da9aa078-692e-4a61-ae9c-ae3d9a7cb577" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_b6f96b46-b253-455c-b4e2-1c1268937481" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b6f96b46-b253-455c-b4e2-1c1268937481_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b6f96b46-b253-455c-b4e2-1c1268937481" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b6f96b46-b253-455c-b4e2-1c1268937481_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fabc778d-7b2b-486e-87b0-8a94f4704440" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b6f96b46-b253-455c-b4e2-1c1268937481" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fabc778d-7b2b-486e-87b0-8a94f4704440" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMember_f314b332-3ec0-4dca-beef-4922684cd665" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fabc778d-7b2b-486e-87b0-8a94f4704440" xlink:to="loc_us-gaap_LongTermDebtMember_f314b332-3ec0-4dca-beef-4922684cd665" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_CreditFacilityMember_edb78ae0-7cfe-40cb-961f-0f6232b304a3" xlink:href="evcm-20211231.xsd#evcm_CreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fabc778d-7b2b-486e-87b0-8a94f4704440" xlink:to="loc_evcm_CreditFacilityMember_edb78ae0-7cfe-40cb-961f-0f6232b304a3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/NatureoftheBusinessDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#NatureoftheBusinessDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/NatureoftheBusinessDetails" xlink:type="extended" id="i5b3f8e675bd6441f8d6c1c13922659b7_NatureoftheBusinessDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiarySaleOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NumberOfCustomers_8b1aee07-c254-4a92-85c8-509a279fa170" xlink:href="evcm-20211231.xsd#evcm_NumberOfCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_evcm_NumberOfCustomers_8b1aee07-c254-4a92-85c8-509a279fa170" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NumberOfCoreVerticals_862160c1-3786-49b1-bb95-e2822e85507e" xlink:href="evcm-20211231.xsd#evcm_NumberOfCoreVerticals"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_evcm_NumberOfCoreVerticals_862160c1-3786-49b1-bb95-e2822e85507e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_ba2c8854-06e9-41a8-b006-1a50c1ae5ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_ba2c8854-06e9-41a8-b006-1a50c1ae5ee7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_5fa9ee6c-8c97-4815-8396-9bf05afbd946" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_5fa9ee6c-8c97-4815-8396-9bf05afbd946" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_5fbdd7a5-72c7-4a70-a2be-c8350836e0f5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_5fbdd7a5-72c7-4a70-a2be-c8350836e0f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_PaymentOfStockIssuanceCostsInitialPublicOfferingRelatedFees_d85c4912-5b3e-4d45-8d9f-9545edbcb744" xlink:href="evcm-20211231.xsd#evcm_PaymentOfStockIssuanceCostsInitialPublicOfferingRelatedFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_evcm_PaymentOfStockIssuanceCostsInitialPublicOfferingRelatedFees_d85c4912-5b3e-4d45-8d9f-9545edbcb744" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SharesAuthorizedCommonAndPreferredStock_ac60441e-a4b0-48a0-b3a8-251fe006db2b" xlink:href="evcm-20211231.xsd#evcm_SharesAuthorizedCommonAndPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_evcm_SharesAuthorizedCommonAndPreferredStock_ac60441e-a4b0-48a0-b3a8-251fe006db2b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_f0acfbc5-d688-431c-a4dc-f5e542878c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_f0acfbc5-d688-431c-a4dc-f5e542878c3e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_69064673-f1a7-4bf0-83a7-690c5f7e4144" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_69064673-f1a7-4bf0-83a7-690c5f7e4144" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_78f9e4b4-d761-4e7d-8ca6-ab4090233960" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_78f9e4b4-d761-4e7d-8ca6-ab4090233960" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_b13fa314-0c65-4c45-bc39-a7dd9a7019e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_b13fa314-0c65-4c45-bc39-a7dd9a7019e6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_e9a7358f-63a4-4213-b393-a179ea3ab2a8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsidiarySaleOfStockLineItems_bd732da4-111b-4086-b673-2a99896ee04b" xlink:to="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_e9a7358f-63a4-4213-b393-a179ea3ab2a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_1f95cabc-29ac-41b7-a14b-708213081f04" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable_e9a7358f-63a4-4213-b393-a179ea3ab2a8" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_1f95cabc-29ac-41b7-a14b-708213081f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_1f95cabc-29ac-41b7-a14b-708213081f04_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_1f95cabc-29ac-41b7-a14b-708213081f04" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_1f95cabc-29ac-41b7-a14b-708213081f04_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_6a84ff25-9652-4fa6-9786-b3ee93ac95e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_1f95cabc-29ac-41b7-a14b-708213081f04" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_6a84ff25-9652-4fa6-9786-b3ee93ac95e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_8f751be4-fdeb-4d62-9dea-e4e96f9721e1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_6a84ff25-9652-4fa6-9786-b3ee93ac95e7" xlink:to="loc_us-gaap_IPOMember_8f751be4-fdeb-4d62-9dea-e4e96f9721e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OverAllotmentOptionMember_a77f702c-2609-49c9-9581-07c630aeab89" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OverAllotmentOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_6a84ff25-9652-4fa6-9786-b3ee93ac95e7" xlink:to="loc_us-gaap_OverAllotmentOptionMember_a77f702c-2609-49c9-9581-07c630aeab89" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" id="ifce79f8f814c48e7b5aaa25cd3a01dde_SummaryofSignificantAccountingPoliciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_bcc999fe-91e6-4474-bb2f-b5aa605afc1a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_05fd2845-7b67-4be7-8ed7-f802e96de043" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_bcc999fe-91e6-4474-bb2f-b5aa605afc1a" xlink:to="loc_us-gaap_NumberOfOperatingSegments_05fd2845-7b67-4be7-8ed7-f802e96de043" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d18d7775-4f6c-4709-b199-f8c369fe66ba" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_bcc999fe-91e6-4474-bb2f-b5aa605afc1a" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_d18d7775-4f6c-4709-b199-f8c369fe66ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_9d874579-953c-40e1-a9d2-d296054cd99a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_bcc999fe-91e6-4474-bb2f-b5aa605afc1a" xlink:to="loc_us-gaap_AdvertisingExpense_9d874579-953c-40e1-a9d2-d296054cd99a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_58fd4d8b-909d-440d-aadc-9ce873bc73ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_bcc999fe-91e6-4474-bb2f-b5aa605afc1a" xlink:to="loc_us-gaap_ConcentrationRiskTable_58fd4d8b-909d-440d-aadc-9ce873bc73ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_be71074b-4b98-42a4-b587-1c5279a5b361" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_58fd4d8b-909d-440d-aadc-9ce873bc73ab" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_be71074b-4b98-42a4-b587-1c5279a5b361" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_be71074b-4b98-42a4-b587-1c5279a5b361_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_be71074b-4b98-42a4-b587-1c5279a5b361" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_be71074b-4b98-42a4-b587-1c5279a5b361_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3da63517-6281-4bc7-8b76-37942f226810" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_be71074b-4b98-42a4-b587-1c5279a5b361" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3da63517-6281-4bc7-8b76-37942f226810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_347cf1a7-8913-4804-8704-3572a7ed3dad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3da63517-6281-4bc7-8b76-37942f226810" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_347cf1a7-8913-4804-8704-3572a7ed3dad" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/SummaryofSignificantAccountingPoliciesUsefulLifeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#SummaryofSignificantAccountingPoliciesUsefulLifeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/SummaryofSignificantAccountingPoliciesUsefulLifeDetails" xlink:type="extended" id="i95d0d60dd5bf4c0faa93a19816d291ab_SummaryofSignificantAccountingPoliciesUsefulLifeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_6bc42846-cfd3-4a99-9b75-efbb248cd58c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_16b85166-aabc-496a-8645-235106d1f5ad" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_6bc42846-cfd3-4a99-9b75-efbb248cd58c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_16b85166-aabc-496a-8645-235106d1f5ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c442a65c-d527-4b89-a0b6-00e0132a21ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_6bc42846-cfd3-4a99-9b75-efbb248cd58c" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c442a65c-d527-4b89-a0b6-00e0132a21ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fa5d04c5-47d8-4f52-a8a4-3c53bbfcbeb0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_c442a65c-d527-4b89-a0b6-00e0132a21ea" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fa5d04c5-47d8-4f52-a8a4-3c53bbfcbeb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fa5d04c5-47d8-4f52-a8a4-3c53bbfcbeb0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fa5d04c5-47d8-4f52-a8a4-3c53bbfcbeb0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_fa5d04c5-47d8-4f52-a8a4-3c53bbfcbeb0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6753e2e3-8b0b-4f0e-903d-6eae4f4f383d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_fa5d04c5-47d8-4f52-a8a4-3c53bbfcbeb0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6753e2e3-8b0b-4f0e-903d-6eae4f4f383d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_3ae86900-31a0-49c5-a37a-9bc301027054" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6753e2e3-8b0b-4f0e-903d-6eae4f4f383d" xlink:to="loc_us-gaap_ComputerEquipmentMember_3ae86900-31a0-49c5-a37a-9bc301027054" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_3f2e2bfa-eefc-4cd9-967b-9569dbd3c83b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6753e2e3-8b0b-4f0e-903d-6eae4f4f383d" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_3f2e2bfa-eefc-4cd9-967b-9569dbd3c83b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/AcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#AcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/AcquisitionsNarrativeDetails" xlink:type="extended" id="ica88aa0f9c2941a4aebc0302e195f2c4_AcquisitionsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_8d84ce32-1d0c-4a55-976b-ed9829371c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_8d84ce32-1d0c-4a55-976b-ed9829371c3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_879cf3b1-8d24-4927-a8b7-d6b66265a74e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_879cf3b1-8d24-4927-a8b7-d6b66265a74e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_a4b8e823-433f-4e7b-ad19-dc1b9ca2f33d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_a4b8e823-433f-4e7b-ad19-dc1b9ca2f33d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_8f9ccf5a-4035-44a5-805d-c7071ae459e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_8f9ccf5a-4035-44a5-805d-c7071ae459e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_3d7d40fd-c198-400a-bfc2-57e09d3e46ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_3d7d40fd-c198-400a-bfc2-57e09d3e46ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_6a7d6896-5906-4532-b8c5-cf714e6cb101" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_6a7d6896-5906-4532-b8c5-cf714e6cb101" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_0cfb9188-569d-43dc-9bc4-b8bdd3ae1bac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_0cfb9188-569d-43dc-9bc4-b8bdd3ae1bac" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_71911bd3-e312-4c94-80b5-e6a998d445d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_71911bd3-e312-4c94-80b5-e6a998d445d4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationContingentConsiderationTotalRevenueTarget_6e86ddf5-9aa6-4d85-977d-98ca9337f3ba" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationContingentConsiderationTotalRevenueTarget"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_evcm_BusinessCombinationContingentConsiderationTotalRevenueTarget_6e86ddf5-9aa6-4d85-977d-98ca9337f3ba" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationContingentConsiderationLiabilityAmountPerYearIfAchievementMet_d4b83423-a1cb-413e-b01e-38daee518529" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationContingentConsiderationLiabilityAmountPerYearIfAchievementMet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_evcm_BusinessCombinationContingentConsiderationLiabilityAmountPerYearIfAchievementMet_d4b83423-a1cb-413e-b01e-38daee518529" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_9e0882cb-4ee6-4136-8ae1-33e6984eb865" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_9e0882cb-4ee6-4136-8ae1-33e6984eb865" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_e68a7a63-3712-4865-be06-6f159766cf89" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1_e68a7a63-3712-4865-be06-6f159766cf89" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_6dfafd3d-4d01-4cbe-bdda-5ed02ed9402a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_6dfafd3d-4d01-4cbe-bdda-5ed02ed9402a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_36f8e4ba-a613-4388-86ab-26d93be3238a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_262d9be6-4b65-47c5-8f47-8e22e1884946" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_36f8e4ba-a613-4388-86ab-26d93be3238a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6084b63c-18bb-4b34-996c-8a253b7d7ee0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_36f8e4ba-a613-4388-86ab-26d93be3238a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6084b63c-18bb-4b34-996c-8a253b7d7ee0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6084b63c-18bb-4b34-996c-8a253b7d7ee0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6084b63c-18bb-4b34-996c-8a253b7d7ee0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6084b63c-18bb-4b34-996c-8a253b7d7ee0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6084b63c-18bb-4b34-996c-8a253b7d7ee0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BriostackMember_e1afe3ae-43de-4c2b-be91-483849c65517" xlink:href="evcm-20211231.xsd#evcm_BriostackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_BriostackMember_e1afe3ae-43de-4c2b-be91-483849c65517" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_PulseMMember_ab0a551f-e838-4a55-b2d1-d67e0037b414" xlink:href="evcm-20211231.xsd#evcm_PulseMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_PulseMMember_ab0a551f-e838-4a55-b2d1-d67e0037b414" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_MDTechMember_48e5323b-062d-4b8e-b312-fba278004f85" xlink:href="evcm-20211231.xsd#evcm_MDTechMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_MDTechMember_48e5323b-062d-4b8e-b312-fba278004f85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TimelyLTDMember_052df8e2-702d-4ebf-8a46-170454b3437e" xlink:href="evcm-20211231.xsd#evcm_TimelyLTDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_TimelyLTDMember_052df8e2-702d-4ebf-8a46-170454b3437e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_DrChronoIncMember_c82e5f88-de8b-4c2e-858f-3d822be998ab" xlink:href="evcm-20211231.xsd#evcm_DrChronoIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_DrChronoIncMember_c82e5f88-de8b-4c2e-858f-3d822be998ab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RemodelingMember_29e679ed-1423-4add-bbb1-9570034a103b" xlink:href="evcm-20211231.xsd#evcm_RemodelingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_RemodelingMember_29e679ed-1423-4add-bbb1-9570034a103b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_QiigoMember_7cdc0955-8f96-424d-b86e-999a69fb8751" xlink:href="evcm-20211231.xsd#evcm_QiigoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_QiigoMember_7cdc0955-8f96-424d-b86e-999a69fb8751" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AlertMDMember_8d14a531-d1d5-4c25-aea5-73a2e3296c1f" xlink:href="evcm-20211231.xsd#evcm_AlertMDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_AlertMDMember_8d14a531-d1d5-4c25-aea5-73a2e3296c1f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_InvoiceSimpleMember_6d17f0dd-7019-4b77-9c49-0aded7492827" xlink:href="evcm-20211231.xsd#evcm_InvoiceSimpleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_InvoiceSimpleMember_6d17f0dd-7019-4b77-9c49-0aded7492827" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BrighterVisionMember_98829c1e-1858-4ce9-aa09-eda4bd7e8ea6" xlink:href="evcm-20211231.xsd#evcm_BrighterVisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_BrighterVisionMember_98829c1e-1858-4ce9-aa09-eda4bd7e8ea6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SociusMember_8094966e-27b0-43fc-8f92-21294d0dad16" xlink:href="evcm-20211231.xsd#evcm_SociusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_SociusMember_8094966e-27b0-43fc-8f92-21294d0dad16" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ServiceFusionMember_e1dffbe5-01f9-441d-a335-fad23a29538d" xlink:href="evcm-20211231.xsd#evcm_ServiceFusionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_ServiceFusionMember_e1dffbe5-01f9-441d-a335-fad23a29538d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_MyPTHubMember_1fe3a8bd-3d15-41d8-b03c-d6d38afc0407" xlink:href="evcm-20211231.xsd#evcm_MyPTHubMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_MyPTHubMember_1fe3a8bd-3d15-41d8-b03c-d6d38afc0407" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_UpdoxMember_37d72682-46a9-42e3-915c-cd65bceed8d1" xlink:href="evcm-20211231.xsd#evcm_UpdoxMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_UpdoxMember_37d72682-46a9-42e3-915c-cd65bceed8d1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AllMedsMember_a2bfcc7f-3ba7-4e24-8d74-f4643011bba9" xlink:href="evcm-20211231.xsd#evcm_AllMedsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_AllMedsMember_a2bfcc7f-3ba7-4e24-8d74-f4643011bba9" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SecureGlobalSolutionsMember_8f0e9f3b-93f2-4715-bc02-f10f6d62a1ed" xlink:href="evcm-20211231.xsd#evcm_SecureGlobalSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_SecureGlobalSolutionsMember_8f0e9f3b-93f2-4715-bc02-f10f6d62a1ed" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_HSRFLMember_a0aa8767-a1db-45f6-8e77-8bc4cde0225f" xlink:href="evcm-20211231.xsd#evcm_HSRFLMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_HSRFLMember_a0aa8767-a1db-45f6-8e77-8bc4cde0225f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SaberMarketingMember_b0093681-a253-4595-ba00-f4f123304f61" xlink:href="evcm-20211231.xsd#evcm_SaberMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_SaberMarketingMember_b0093681-a253-4595-ba00-f4f123304f61" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_StudioDirectorMember_a3e9ea84-7763-4077-90c6-87821d60aea8" xlink:href="evcm-20211231.xsd#evcm_StudioDirectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_StudioDirectorMember_a3e9ea84-7763-4077-90c6-87821d60aea8" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_A33MileRadiusMember_45bcca53-d155-4515-bdba-734e93bfaab1" xlink:href="evcm-20211231.xsd#evcm_A33MileRadiusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_A33MileRadiusMember_45bcca53-d155-4515-bdba-734e93bfaab1" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_EProviderSolutionsMember_cb781f0f-120b-4369-9316-a763f291d432" xlink:href="evcm-20211231.xsd#evcm_EProviderSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_EProviderSolutionsMember_cb781f0f-120b-4369-9316-a763f291d432" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_CollaborateMDMember_1e9e9a53-d706-4529-a407-6e163f67136f" xlink:href="evcm-20211231.xsd#evcm_CollaborateMDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_CollaborateMDMember_1e9e9a53-d706-4529-a407-6e163f67136f" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SecurityInformationSystemsMember_da96bcfe-db32-4d99-9aea-461cae5914dc" xlink:href="evcm-20211231.xsd#evcm_SecurityInformationSystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_SecurityInformationSystemsMember_da96bcfe-db32-4d99-9aea-461cae5914dc" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AmericanServiceFinanceMember_3e5ba9d0-4a6d-463b-b57a-10e381797f7d" xlink:href="evcm-20211231.xsd#evcm_AmericanServiceFinanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_AmericanServiceFinanceMember_3e5ba9d0-4a6d-463b-b57a-10e381797f7d" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_JimmyMarketingMember_a1909610-4f1d-486b-b693-7b38361689b4" xlink:href="evcm-20211231.xsd#evcm_JimmyMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_JimmyMarketingMember_a1909610-4f1d-486b-b693-7b38361689b4" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ClubwiseMember_4620ce1e-fc97-4f06-9afb-301cfac1aa26" xlink:href="evcm-20211231.xsd#evcm_ClubwiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_ClubwiseMember_4620ce1e-fc97-4f06-9afb-301cfac1aa26" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RoofsnapMember_f48f8b6a-a11a-4154-ac37-68a8842731b0" xlink:href="evcm-20211231.xsd#evcm_RoofsnapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_311502ed-95d1-4e03-b573-7e1d626c23f4" xlink:to="loc_evcm_RoofsnapMember_f48f8b6a-a11a-4154-ac37-68a8842731b0" xlink:type="arc" order="26"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/AcquisitionsConsiderationTransferredandNetAssetsAcquiredDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#AcquisitionsConsiderationTransferredandNetAssetsAcquiredDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/AcquisitionsConsiderationTransferredandNetAssetsAcquiredDetails" xlink:type="extended" id="i5c3d8c86d199488ca331d0036267f2be_AcquisitionsConsiderationTransferredandNetAssetsAcquiredDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_ac34a293-fcd6-4c4c-b44e-f2be38aca62a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_0e07adb3-7f34-4789-8882-21b1984d0a65" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ac34a293-fcd6-4c4c-b44e-f2be38aca62a" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_0e07adb3-7f34-4789-8882-21b1984d0a65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_97ccb484-ae49-4412-a62b-3c034d820d20" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ac34a293-fcd6-4c4c-b44e-f2be38aca62a" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_97ccb484-ae49-4412-a62b-3c034d820d20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationConsiderationTransferredFairValueOfEarnout_f4be052a-7659-4693-8721-9fba590eeeb2" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationConsiderationTransferredFairValueOfEarnout"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ac34a293-fcd6-4c4c-b44e-f2be38aca62a" xlink:to="loc_evcm_BusinessCombinationConsiderationTransferredFairValueOfEarnout_f4be052a-7659-4693-8721-9fba590eeeb2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_ece3a814-3dab-48e2-bb2b-b42ec82a0608" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ac34a293-fcd6-4c4c-b44e-f2be38aca62a" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_ece3a814-3dab-48e2-bb2b-b42ec82a0608" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ac34a293-fcd6-4c4c-b44e-f2be38aca62a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_5b403ece-1407-4e12-8cf8-90da09a666e8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_5b403ece-1407-4e12-8cf8-90da09a666e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAccountsReceivableTrade_660b259e-d930-4fc2-a29c-1cb805f1898a" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAccountsReceivableTrade"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsAccountsReceivableTrade_660b259e-d930-4fc2-a29c-1cb805f1898a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherReceivables_694c49a2-c7d1-4cd1-8893-00f8767b3215" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOtherReceivables_694c49a2-c7d1-4cd1-8893-00f8767b3215" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsContractAssets_36472274-de7e-4bea-9f05-12fb5ba2e1b4" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsContractAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsContractAssets_36472274-de7e-4bea-9f05-12fb5ba2e1b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_6ac9519d-6e10-4924-8382-f38514747fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_6ac9519d-6e10-4924-8382-f38514747fe1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5cf8a0dd-75c1-4c7d-9ed5-22381cafa1ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_5cf8a0dd-75c1-4c7d-9ed5-22381cafa1ef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_657c517b-dc06-4de9-8969-9752d27d357c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_657c517b-dc06-4de9-8969-9752d27d357c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_054b950a-4b42-48a8-9d15-d1f17a48f5e9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_054b950a-4b42-48a8-9d15-d1f17a48f5e9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_1d50abfb-1634-4e3d-a477-c4526b7a55d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_Goodwill_1d50abfb-1634-4e3d-a477-c4526b7a55d3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_eeca8ae3-843f-4f17-b90e-cf1cf8f54c3a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssets_eeca8ae3-843f-4f17-b90e-cf1cf8f54c3a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_7508a577-6861-4baa-b7c7-2e09981ef15a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_7508a577-6861-4baa-b7c7-2e09981ef15a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_7abb6f94-bb59-4e24-b99f-418f1cc2fdab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_7abb6f94-bb59-4e24-b99f-418f1cc2fdab" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilitiesAndOther_59f573c8-fd5b-463e-b8c8-563e80640872" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilitiesAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedLiabilitiesAndOther_59f573c8-fd5b-463e-b8c8-563e80640872" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerDeposit_e7fc825d-1b97-44ea-b07e-5f25f79ea34e" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerDeposit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCustomerDeposit_e7fc825d-1b97-44ea-b07e-5f25f79ea34e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_a00c3a78-a1a6-4426-abfc-125519b5dbbd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_a00c3a78-a1a6-4426-abfc-125519b5dbbd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredRevenue_4b9ac2af-e21d-4bf8-9c92-b510c8fcb71b" xlink:href="evcm-20211231.xsd#evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_evcm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredRevenue_4b9ac2af-e21d-4bf8-9c92-b510c8fcb71b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_93cf0bde-2699-419b-82a1-e95886b91ba6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNetAbstract_4db3008d-a5d4-48a4-abfe-e5a107f3cab5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_93cf0bde-2699-419b-82a1-e95886b91ba6" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_bf46d8cc-348a-4778-91ae-39ca7661f763" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_ac34a293-fcd6-4c4c-b44e-f2be38aca62a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_bf46d8cc-348a-4778-91ae-39ca7661f763" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_50d25b80-3591-478c-aedf-7246c7139e2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_bf46d8cc-348a-4778-91ae-39ca7661f763" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_50d25b80-3591-478c-aedf-7246c7139e2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_50d25b80-3591-478c-aedf-7246c7139e2c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_50d25b80-3591-478c-aedf-7246c7139e2c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_50d25b80-3591-478c-aedf-7246c7139e2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f65b095a-aeef-44c6-a6e5-0f131d8730f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_50d25b80-3591-478c-aedf-7246c7139e2c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f65b095a-aeef-44c6-a6e5-0f131d8730f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_Acquisitions2021Member_ed8fc4f1-be94-4bbe-8b29-10e41307d8bb" xlink:href="evcm-20211231.xsd#evcm_Acquisitions2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f65b095a-aeef-44c6-a6e5-0f131d8730f9" xlink:to="loc_evcm_Acquisitions2021Member_ed8fc4f1-be94-4bbe-8b29-10e41307d8bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BriostackMember_7e454769-7cc4-4cef-a4d8-39a13304e0ef" xlink:href="evcm-20211231.xsd#evcm_BriostackMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2021Member_ed8fc4f1-be94-4bbe-8b29-10e41307d8bb" xlink:to="loc_evcm_BriostackMember_7e454769-7cc4-4cef-a4d8-39a13304e0ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_PulseMMember_aacc5d51-43a9-488a-aba9-f8e784855afb" xlink:href="evcm-20211231.xsd#evcm_PulseMMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2021Member_ed8fc4f1-be94-4bbe-8b29-10e41307d8bb" xlink:to="loc_evcm_PulseMMember_aacc5d51-43a9-488a-aba9-f8e784855afb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_MDTechMember_02b44c04-f78d-414c-b356-86f89f0a5ee7" xlink:href="evcm-20211231.xsd#evcm_MDTechMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2021Member_ed8fc4f1-be94-4bbe-8b29-10e41307d8bb" xlink:to="loc_evcm_MDTechMember_02b44c04-f78d-414c-b356-86f89f0a5ee7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TimelyLTDMember_59abe1fd-57de-43a0-baef-3383c95fad62" xlink:href="evcm-20211231.xsd#evcm_TimelyLTDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2021Member_ed8fc4f1-be94-4bbe-8b29-10e41307d8bb" xlink:to="loc_evcm_TimelyLTDMember_59abe1fd-57de-43a0-baef-3383c95fad62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_DrChronoIncMember_98b66705-f14d-4cbc-9858-4ae64faff34d" xlink:href="evcm-20211231.xsd#evcm_DrChronoIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2021Member_ed8fc4f1-be94-4bbe-8b29-10e41307d8bb" xlink:to="loc_evcm_DrChronoIncMember_98b66705-f14d-4cbc-9858-4ae64faff34d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:href="evcm-20211231.xsd#evcm_Acquisitions2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f65b095a-aeef-44c6-a6e5-0f131d8730f9" xlink:to="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RemodelingMember_c24e625b-de50-4603-9297-00b1a273ce87" xlink:href="evcm-20211231.xsd#evcm_RemodelingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_RemodelingMember_c24e625b-de50-4603-9297-00b1a273ce87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_QiigoMember_bd952b71-c474-4142-8af4-dc39d340074e" xlink:href="evcm-20211231.xsd#evcm_QiigoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_QiigoMember_bd952b71-c474-4142-8af4-dc39d340074e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AlertMDMember_c13233ad-fc59-49b7-a60a-003e01990b52" xlink:href="evcm-20211231.xsd#evcm_AlertMDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_AlertMDMember_c13233ad-fc59-49b7-a60a-003e01990b52" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_InvoiceSimpleMember_d54031ee-16b2-491d-ba49-8ac23876008d" xlink:href="evcm-20211231.xsd#evcm_InvoiceSimpleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_InvoiceSimpleMember_d54031ee-16b2-491d-ba49-8ac23876008d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BrighterVisionMember_88a8ea47-afe3-4546-93a1-a96a7b365ba6" xlink:href="evcm-20211231.xsd#evcm_BrighterVisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_BrighterVisionMember_88a8ea47-afe3-4546-93a1-a96a7b365ba6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SociusMember_98c3fef5-5a22-4ccd-8956-53f20b569e45" xlink:href="evcm-20211231.xsd#evcm_SociusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_SociusMember_98c3fef5-5a22-4ccd-8956-53f20b569e45" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ServiceFusionMember_7e7c80c1-3715-4072-982f-115b499f4541" xlink:href="evcm-20211231.xsd#evcm_ServiceFusionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_ServiceFusionMember_7e7c80c1-3715-4072-982f-115b499f4541" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_MyPTHubMember_0fda4126-733c-4bf0-9f04-193f165caa1f" xlink:href="evcm-20211231.xsd#evcm_MyPTHubMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_MyPTHubMember_0fda4126-733c-4bf0-9f04-193f165caa1f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_UpdoxMember_d04e3584-dc2d-45f8-9b63-2da782e0d1e7" xlink:href="evcm-20211231.xsd#evcm_UpdoxMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_UpdoxMember_d04e3584-dc2d-45f8-9b63-2da782e0d1e7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_OtherAcquisitionsMember_d9cc2b92-1e5b-46d2-ba6e-761cd4bc462f" xlink:href="evcm-20211231.xsd#evcm_OtherAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2020Member_6d6e97c7-01c5-4977-a65d-bf598ad6c18a" xlink:to="loc_evcm_OtherAcquisitionsMember_d9cc2b92-1e5b-46d2-ba6e-761cd4bc462f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:href="evcm-20211231.xsd#evcm_Acquisitions2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f65b095a-aeef-44c6-a6e5-0f131d8730f9" xlink:to="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AllMedsMember_5e33a493-089e-43f3-999e-7c22072717f0" xlink:href="evcm-20211231.xsd#evcm_AllMedsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_AllMedsMember_5e33a493-089e-43f3-999e-7c22072717f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SecureGlobalSolutionsMember_7eb03b9f-8ce6-47b7-be40-1007d9a630c2" xlink:href="evcm-20211231.xsd#evcm_SecureGlobalSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_SecureGlobalSolutionsMember_7eb03b9f-8ce6-47b7-be40-1007d9a630c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_HSRFLMember_02355a35-7fbd-4b23-870d-623aaed50378" xlink:href="evcm-20211231.xsd#evcm_HSRFLMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_HSRFLMember_02355a35-7fbd-4b23-870d-623aaed50378" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SaberMarketingMember_91a10c2f-0bb0-4702-b23f-d069d731e662" xlink:href="evcm-20211231.xsd#evcm_SaberMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_SaberMarketingMember_91a10c2f-0bb0-4702-b23f-d069d731e662" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_StudioDirectorMember_bcba016a-b1f9-411f-a7de-097676e48978" xlink:href="evcm-20211231.xsd#evcm_StudioDirectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_StudioDirectorMember_bcba016a-b1f9-411f-a7de-097676e48978" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_A33MileRadiusMember_1923ae07-50aa-4e57-a938-a2cae4fe429e" xlink:href="evcm-20211231.xsd#evcm_A33MileRadiusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_A33MileRadiusMember_1923ae07-50aa-4e57-a938-a2cae4fe429e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_EProviderSolutionsMember_2509ec35-5bcf-4ec6-b523-a02a7a1ef539" xlink:href="evcm-20211231.xsd#evcm_EProviderSolutionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_EProviderSolutionsMember_2509ec35-5bcf-4ec6-b523-a02a7a1ef539" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_CollaborateMDMember_d7ee3b39-831d-4734-bc2e-b0d0d50884f4" xlink:href="evcm-20211231.xsd#evcm_CollaborateMDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_CollaborateMDMember_d7ee3b39-831d-4734-bc2e-b0d0d50884f4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SecurityInformationSystemsMember_5d405fb9-fc5f-4002-989e-49440f4a0a4a" xlink:href="evcm-20211231.xsd#evcm_SecurityInformationSystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_SecurityInformationSystemsMember_5d405fb9-fc5f-4002-989e-49440f4a0a4a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AmericanServiceFinanceMember_ddef8a53-1bce-45ed-beaf-bc33fc483629" xlink:href="evcm-20211231.xsd#evcm_AmericanServiceFinanceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_AmericanServiceFinanceMember_ddef8a53-1bce-45ed-beaf-bc33fc483629" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_JimmyMarketingMember_9f3b5deb-a9b8-4ab8-a3ea-d800a6ded75f" xlink:href="evcm-20211231.xsd#evcm_JimmyMarketingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_JimmyMarketingMember_9f3b5deb-a9b8-4ab8-a3ea-d800a6ded75f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ClubwiseMember_b064ccb0-9d35-4dc5-a1b3-c3d486773fc6" xlink:href="evcm-20211231.xsd#evcm_ClubwiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_ClubwiseMember_b064ccb0-9d35-4dc5-a1b3-c3d486773fc6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RoofsnapMember_92804d81-eae6-47bf-885d-4e50040da04b" xlink:href="evcm-20211231.xsd#evcm_RoofsnapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_evcm_Acquisitions2019Member_4e2f533d-3601-4ade-bc96-a7d5548653f0" xlink:to="loc_evcm_RoofsnapMember_92804d81-eae6-47bf-885d-4e50040da04b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_72933b7e-86fd-41bd-aa58-d7143110d673" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_bf46d8cc-348a-4778-91ae-39ca7661f763" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_72933b7e-86fd-41bd-aa58-d7143110d673" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_72933b7e-86fd-41bd-aa58-d7143110d673_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_72933b7e-86fd-41bd-aa58-d7143110d673" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_72933b7e-86fd-41bd-aa58-d7143110d673_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9118643b-0a42-4c6f-b7c9-4b841f201861" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_72933b7e-86fd-41bd-aa58-d7143110d673" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9118643b-0a42-4c6f-b7c9-4b841f201861" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_1c29b5a6-28eb-4935-8adf-fd82f8007674" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9118643b-0a42-4c6f-b7c9-4b841f201861" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_1c29b5a6-28eb-4935-8adf-fd82f8007674" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_69ea08f0-b401-4b38-a4d9-f7daef443384" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9118643b-0a42-4c6f-b7c9-4b841f201861" xlink:to="loc_us-gaap_CustomerRelationshipsMember_69ea08f0-b401-4b38-a4d9-f7daef443384" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_b8877397-a9d7-4627-89b5-aff4e5f0aca3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9118643b-0a42-4c6f-b7c9-4b841f201861" xlink:to="loc_us-gaap_TradeNamesMember_b8877397-a9d7-4627-89b5-aff4e5f0aca3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_86152e73-7f17-45b6-be8a-918871d6297d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9118643b-0a42-4c6f-b7c9-4b841f201861" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_86152e73-7f17-45b6-be8a-918871d6297d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GovernmentContractMember_b3064f42-ed0f-478d-b920-e50f9023c1d5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GovernmentContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9118643b-0a42-4c6f-b7c9-4b841f201861" xlink:to="loc_us-gaap_GovernmentContractMember_b3064f42-ed0f-478d-b920-e50f9023c1d5" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/RevenueDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#RevenueDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/RevenueDisaggregationofRevenueDetails" xlink:type="extended" id="i351acb271b3b46a98f1facc343c88432_RevenueDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_4bdf60fd-8d42-4d24-aee7-76cc2758a029" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6f96f975-de24-4195-b4fa-ad56cbc9a644" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4bdf60fd-8d42-4d24-aee7-76cc2758a029" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_6f96f975-de24-4195-b4fa-ad56cbc9a644" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_8978256f-8b69-40dc-a991-28f9e7eb774e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_4bdf60fd-8d42-4d24-aee7-76cc2758a029" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_8978256f-8b69-40dc-a991-28f9e7eb774e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_55718ffe-3e81-4e45-8924-6114375527a0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8978256f-8b69-40dc-a991-28f9e7eb774e" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_55718ffe-3e81-4e45-8924-6114375527a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_55718ffe-3e81-4e45-8924-6114375527a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_55718ffe-3e81-4e45-8924-6114375527a0" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_55718ffe-3e81-4e45-8924-6114375527a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1feb3dd6-ea1d-4456-8bb8-eaa98702db18" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_55718ffe-3e81-4e45-8924-6114375527a0" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1feb3dd6-ea1d-4456-8bb8-eaa98702db18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_35c32540-d887-4bd3-b5e2-f7813ecea29f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1feb3dd6-ea1d-4456-8bb8-eaa98702db18" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_35c32540-d887-4bd3-b5e2-f7813ecea29f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_2c768880-e4d4-417d-aef1-65b37bbc9174" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_1feb3dd6-ea1d-4456-8bb8-eaa98702db18" xlink:to="loc_us-gaap_TransferredOverTimeMember_2c768880-e4d4-417d-aef1-65b37bbc9174" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_61fb61c9-652e-47a0-9da4-c4b5d62d49e7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_8978256f-8b69-40dc-a991-28f9e7eb774e" xlink:to="loc_srt_StatementGeographicalAxis_61fb61c9-652e-47a0-9da4-c4b5d62d49e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_61fb61c9-652e-47a0-9da4-c4b5d62d49e7_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_61fb61c9-652e-47a0-9da4-c4b5d62d49e7" xlink:to="loc_srt_SegmentGeographicalDomain_61fb61c9-652e-47a0-9da4-c4b5d62d49e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_2845e5cf-b4cb-4286-84f8-87fea3424d5b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_61fb61c9-652e-47a0-9da4-c4b5d62d49e7" xlink:to="loc_srt_SegmentGeographicalDomain_2845e5cf-b4cb-4286-84f8-87fea3424d5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_9c129e85-969b-4df1-8dd3-fa350c8d923f" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2845e5cf-b4cb-4286-84f8-87fea3424d5b" xlink:to="loc_country_US_9c129e85-969b-4df1-8dd3-fa350c8d923f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_29def418-795c-43d4-8ba9-3e4a93ca17df" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_2845e5cf-b4cb-4286-84f8-87fea3424d5b" xlink:to="loc_us-gaap_NonUsMember_29def418-795c-43d4-8ba9-3e4a93ca17df" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/RevenueNarrativeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#RevenueNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/RevenueNarrativeDetails" xlink:type="extended" id="i798f1b6fd00d4d7f926418c352c109f3_RevenueNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_d808f596-7669-4402-aabb-293b3e5e0124" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_dba0a318-a966-4c67-aac6-92a9670b2b58" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_d808f596-7669-4402-aabb-293b3e5e0124" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_dba0a318-a966-4c67-aac6-92a9670b2b58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortizationPeriod_e9fd7604-8b1c-480c-8f06-93b1705b009f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedContractCostAmortizationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_d808f596-7669-4402-aabb-293b3e5e0124" xlink:to="loc_us-gaap_CapitalizedContractCostAmortizationPeriod_e9fd7604-8b1c-480c-8f06-93b1705b009f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetCurrent_f1047712-2db6-467d-8bc9-0a96267e8a7b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedContractCostNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_d808f596-7669-4402-aabb-293b3e5e0124" xlink:to="loc_us-gaap_CapitalizedContractCostNetCurrent_f1047712-2db6-467d-8bc9-0a96267e8a7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_50b9b57f-f1ae-4082-8bc3-17d92944c432" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_d808f596-7669-4402-aabb-293b3e5e0124" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_50b9b57f-f1ae-4082-8bc3-17d92944c432" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_3e52bfe9-c1d6-4ebf-836a-aa5d1293794d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_d808f596-7669-4402-aabb-293b3e5e0124" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_3e52bfe9-c1d6-4ebf-836a-aa5d1293794d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_685ca761-2ed0-4d12-82fa-032ad0605fab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_d808f596-7669-4402-aabb-293b3e5e0124" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_685ca761-2ed0-4d12-82fa-032ad0605fab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_8550c7dc-66af-4763-8c14-f626c4d8bc60" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_685ca761-2ed0-4d12-82fa-032ad0605fab" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_8550c7dc-66af-4763-8c14-f626c4d8bc60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_8550c7dc-66af-4763-8c14-f626c4d8bc60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8550c7dc-66af-4763-8c14-f626c4d8bc60" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_8550c7dc-66af-4763-8c14-f626c4d8bc60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_dca903da-02d6-446b-beed-9396577d060b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8550c7dc-66af-4763-8c14-f626c4d8bc60" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_dca903da-02d6-446b-beed-9396577d060b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_44222e11-4356-4abb-b26a-67382cf0faee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_dca903da-02d6-446b-beed-9396577d060b" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_44222e11-4356-4abb-b26a-67382cf0faee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_c1e0b606-adea-4c3f-8e50-68183145975e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_dca903da-02d6-446b-beed-9396577d060b" xlink:to="loc_us-gaap_CostOfSalesMember_c1e0b606-adea-4c3f-8e50-68183145975e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/RevenueRemainingPerformanceObligationsDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#RevenueRemainingPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/RevenueRemainingPerformanceObligationsDetails" xlink:type="extended" id="idac1fd64ce914e749f98f14ddfd28a4f_RevenueRemainingPerformanceObligationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_0194d117-3093-47ca-929f-8ecc5d531c97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_0194d117-3093-47ca-929f-8ecc5d531c97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0b2034c8-0d51-4090-9cb6-b1edbc6b166a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0b2034c8-0d51-4090-9cb6-b1edbc6b166a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9a45aa0d-5077-41fd-af1b-705aa7ce019e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9a45aa0d-5077-41fd-af1b-705aa7ce019e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_66819afe-1e0b-46d9-9196-8462bb89e452" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_66819afe-1e0b-46d9-9196-8462bb89e452" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_87382c50-5935-49e4-8499-05e1f8fe9871" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_66819afe-1e0b-46d9-9196-8462bb89e452" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_87382c50-5935-49e4-8499-05e1f8fe9871" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/RevenueRemainingPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="evcm-20211231.xsd#RevenueRemainingPerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/RevenueRemainingPerformanceObligationsDetails_1" xlink:type="extended" id="i2916d5c39c4a4d86a6b64f062333ce71_RevenueRemainingPerformanceObligationsDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_0194d117-3093-47ca-929f-8ecc5d531c97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_0194d117-3093-47ca-929f-8ecc5d531c97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0b2034c8-0d51-4090-9cb6-b1edbc6b166a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_0b2034c8-0d51-4090-9cb6-b1edbc6b166a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9a45aa0d-5077-41fd-af1b-705aa7ce019e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_9a45aa0d-5077-41fd-af1b-705aa7ce019e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_66819afe-1e0b-46d9-9196-8462bb89e452" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_cdd674fa-d081-42da-9ecc-69aa0d3ac3dd" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_66819afe-1e0b-46d9-9196-8462bb89e452" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/IntangibleAssetsSummaryDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#IntangibleAssetsSummaryDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/IntangibleAssetsSummaryDetails" xlink:type="extended" id="i37cc1cc62e66464fb93b47de60d9afeb_IntangibleAssetsSummaryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_a2d4d8e4-ffb3-41d7-b325-e70a9b640091" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_2b27eca2-1174-4db6-b69f-50bd1b7793fd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_a2d4d8e4-ffb3-41d7-b325-e70a9b640091" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_2b27eca2-1174-4db6-b69f-50bd1b7793fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_f65d3278-1c50-4747-8793-faa80cf03ad7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_a2d4d8e4-ffb3-41d7-b325-e70a9b640091" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_f65d3278-1c50-4747-8793-faa80cf03ad7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_951c9d60-ee0d-4b25-ba2d-36df9da8dd96" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_a2d4d8e4-ffb3-41d7-b325-e70a9b640091" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_951c9d60-ee0d-4b25-ba2d-36df9da8dd96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d0a4e8a9-f932-412a-a1c3-e9d831c8b5ec" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_a2d4d8e4-ffb3-41d7-b325-e70a9b640091" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d0a4e8a9-f932-412a-a1c3-e9d831c8b5ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_376bba52-4aa6-4e5b-a5f9-d5328599959a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_a2d4d8e4-ffb3-41d7-b325-e70a9b640091" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_376bba52-4aa6-4e5b-a5f9-d5328599959a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6aec907b-37a3-40c0-8005-e12e19826ae2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_376bba52-4aa6-4e5b-a5f9-d5328599959a" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6aec907b-37a3-40c0-8005-e12e19826ae2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6aec907b-37a3-40c0-8005-e12e19826ae2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6aec907b-37a3-40c0-8005-e12e19826ae2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6aec907b-37a3-40c0-8005-e12e19826ae2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4e99bfac-54fb-43d2-8eb4-b6a88b46abd6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_6aec907b-37a3-40c0-8005-e12e19826ae2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4e99bfac-54fb-43d2-8eb4-b6a88b46abd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_cbd34039-1255-4afc-9176-242d547e5b07" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4e99bfac-54fb-43d2-8eb4-b6a88b46abd6" xlink:to="loc_us-gaap_CustomerRelationshipsMember_cbd34039-1255-4afc-9176-242d547e5b07" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_82f52ad1-9df8-4eee-bee2-d0e67145fe78" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4e99bfac-54fb-43d2-8eb4-b6a88b46abd6" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_82f52ad1-9df8-4eee-bee2-d0e67145fe78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_4bc97b9e-51af-4626-af54-946b6b660ece" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4e99bfac-54fb-43d2-8eb4-b6a88b46abd6" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_4bc97b9e-51af-4626-af54-946b6b660ece" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_f7d480fb-a29d-42c3-9688-783fe8062533" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_4e99bfac-54fb-43d2-8eb4-b6a88b46abd6" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_f7d480fb-a29d-42c3-9688-783fe8062533" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_800b0d6a-634c-4c21-b0e7-c7fcba33d625" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_376bba52-4aa6-4e5b-a5f9-d5328599959a" xlink:to="loc_srt_RangeAxis_800b0d6a-634c-4c21-b0e7-c7fcba33d625" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_800b0d6a-634c-4c21-b0e7-c7fcba33d625_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_800b0d6a-634c-4c21-b0e7-c7fcba33d625" xlink:to="loc_srt_RangeMember_800b0d6a-634c-4c21-b0e7-c7fcba33d625_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d0a8e7a6-eba9-453e-bc61-bccc5316a852" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_800b0d6a-634c-4c21-b0e7-c7fcba33d625" xlink:to="loc_srt_RangeMember_d0a8e7a6-eba9-453e-bc61-bccc5316a852" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_95a482f7-0151-43c1-bc4d-37e503a7b65a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d0a8e7a6-eba9-453e-bc61-bccc5316a852" xlink:to="loc_srt_MinimumMember_95a482f7-0151-43c1-bc4d-37e503a7b65a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_91a90d0e-6ce1-4d92-be5b-360be011ac2a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d0a8e7a6-eba9-453e-bc61-bccc5316a852" xlink:to="loc_srt_MaximumMember_91a90d0e-6ce1-4d92-be5b-360be011ac2a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/PropertyandEquipmentSummaryDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#PropertyandEquipmentSummaryDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/PropertyandEquipmentSummaryDetails" xlink:type="extended" id="i4ddcc04175a34335aca4a7bf1db367d7_PropertyandEquipmentSummaryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_caf6e5e0-9d23-4c40-a25a-05fa848a4dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_8be32c5d-487c-4c7c-a227-7fb7ffb0a480" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_caf6e5e0-9d23-4c40-a25a-05fa848a4dfb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_8be32c5d-487c-4c7c-a227-7fb7ffb0a480" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0051f43c-fafd-4a86-9951-e4e4a423fd30" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_caf6e5e0-9d23-4c40-a25a-05fa848a4dfb" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0051f43c-fafd-4a86-9951-e4e4a423fd30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_01a11231-d4df-4a13-a799-b166ec56801d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_caf6e5e0-9d23-4c40-a25a-05fa848a4dfb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_01a11231-d4df-4a13-a799-b166ec56801d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_fce17d06-9e9d-490e-93be-e8ce9bcbbcc9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_caf6e5e0-9d23-4c40-a25a-05fa848a4dfb" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_fce17d06-9e9d-490e-93be-e8ce9bcbbcc9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6223bf1a-75fe-4ab6-ab7e-d7ca5c094b4b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_fce17d06-9e9d-490e-93be-e8ce9bcbbcc9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6223bf1a-75fe-4ab6-ab7e-d7ca5c094b4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6223bf1a-75fe-4ab6-ab7e-d7ca5c094b4b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6223bf1a-75fe-4ab6-ab7e-d7ca5c094b4b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_6223bf1a-75fe-4ab6-ab7e-d7ca5c094b4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8b4e228c-be56-4125-be84-29e309adc7e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_6223bf1a-75fe-4ab6-ab7e-d7ca5c094b4b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8b4e228c-be56-4125-be84-29e309adc7e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_6dcc3709-0393-4da7-9273-6b0091917923" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8b4e228c-be56-4125-be84-29e309adc7e6" xlink:to="loc_us-gaap_ComputerEquipmentMember_6dcc3709-0393-4da7-9273-6b0091917923" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_e40efad1-e6c5-476a-aa00-baefc338dbfb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8b4e228c-be56-4125-be84-29e309adc7e6" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_e40efad1-e6c5-476a-aa00-baefc338dbfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_56cd2b61-71e4-40b6-9fdc-146fd0894bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_8b4e228c-be56-4125-be84-29e309adc7e6" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_56cd2b61-71e4-40b6-9fdc-146fd0894bd2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/LongTermDebtSummaryofDebtDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#LongTermDebtSummaryofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/LongTermDebtSummaryofDebtDetails" xlink:type="extended" id="ia8418e8f2cc948fab8409e233f6a65ba_LongTermDebtSummaryofDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_3f7efd84-1bed-46c2-8800-1a1015fffa14" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_3f7efd84-1bed-46c2-8800-1a1015fffa14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_b55a977d-b51b-4502-9db9-428b5ffbbb6e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_b55a977d-b51b-4502-9db9-428b5ffbbb6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_1d2c88fc-8adf-4d3c-921e-190c9e5a9216" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_1d2c88fc-8adf-4d3c-921e-190c9e5a9216" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_0356cc67-416d-49da-ba9a-ad9ae89eb1a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_LongTermDebt_0356cc67-416d-49da-ba9a-ad9ae89eb1a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_e11483b9-bb98-4906-a517-46bdd946ad19" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_LongTermDebtCurrent_e11483b9-bb98-4906-a517-46bdd946ad19" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_1d134419-b1b9-4d04-9958-eb272f9c30b1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_1d134419-b1b9-4d04-9958-eb272f9c30b1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0d75623d-e3e4-495d-9279-45794abc6ff0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_0d75623d-e3e4-495d-9279-45794abc6ff0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_807c34b3-e2fb-444f-bc96-047da971c7bb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_807c34b3-e2fb-444f-bc96-047da971c7bb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_DebtInstrumentPeriodicPaymentTermsPercentageOfOriginalPrincipalBalance_7cdca8dc-75de-4a10-af91-56dbc6422aee" xlink:href="evcm-20211231.xsd#evcm_DebtInstrumentPeriodicPaymentTermsPercentageOfOriginalPrincipalBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_evcm_DebtInstrumentPeriodicPaymentTermsPercentageOfOriginalPrincipalBalance_7cdca8dc-75de-4a10-af91-56dbc6422aee" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1b346e0e-1433-449e-9abe-7c93727a2af5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1b346e0e-1433-449e-9abe-7c93727a2af5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_0b045756-3da4-456d-9667-7a94f299af78" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_5d538f1c-b1fb-462e-b16b-230df1c4565d" xlink:to="loc_us-gaap_DebtInstrumentTable_0b045756-3da4-456d-9667-7a94f299af78" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6cefebd9-e907-49dc-a33f-726cf491c3e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0b045756-3da4-456d-9667-7a94f299af78" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_6cefebd9-e907-49dc-a33f-726cf491c3e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6cefebd9-e907-49dc-a33f-726cf491c3e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6cefebd9-e907-49dc-a33f-726cf491c3e2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6cefebd9-e907-49dc-a33f-726cf491c3e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7200e798-33a2-4e27-94d6-b7a01b997d88" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6cefebd9-e907-49dc-a33f-726cf491c3e2" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7200e798-33a2-4e27-94d6-b7a01b997d88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_f7a3979e-ff64-4d1c-a448-d347629ac486" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7200e798-33a2-4e27-94d6-b7a01b997d88" xlink:to="loc_us-gaap_LoansPayableMember_f7a3979e-ff64-4d1c-a448-d347629ac486" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AssetPurchaseAgreementMember_d828e374-b3fb-46bf-8f5d-35605aebaee5" xlink:href="evcm-20211231.xsd#evcm_AssetPurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7200e798-33a2-4e27-94d6-b7a01b997d88" xlink:to="loc_evcm_AssetPurchaseAgreementMember_d828e374-b3fb-46bf-8f5d-35605aebaee5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_8fd65b93-3388-462e-a79d-a1736f53c939" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7200e798-33a2-4e27-94d6-b7a01b997d88" xlink:to="loc_us-gaap_SubordinatedDebtMember_8fd65b93-3388-462e-a79d-a1736f53c939" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_2f90b616-fa88-45d1-b3a5-f94094f06991" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0b045756-3da4-456d-9667-7a94f299af78" xlink:to="loc_us-gaap_DebtInstrumentAxis_2f90b616-fa88-45d1-b3a5-f94094f06991" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2f90b616-fa88-45d1-b3a5-f94094f06991_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_2f90b616-fa88-45d1-b3a5-f94094f06991" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2f90b616-fa88-45d1-b3a5-f94094f06991_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_2f90b616-fa88-45d1-b3a5-f94094f06991" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NewTermLoanMember_09827a87-cf73-43d3-9d92-a6b66aaae285" xlink:href="evcm-20211231.xsd#evcm_NewTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:to="loc_evcm_NewTermLoanMember_09827a87-cf73-43d3-9d92-a6b66aaae285" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NewRevolverMember_f98d4629-1010-487c-bbc1-14b553a9f16c" xlink:href="evcm-20211231.xsd#evcm_NewRevolverMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:to="loc_evcm_NewRevolverMember_f98d4629-1010-487c-bbc1-14b553a9f16c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TermNotesMember_2e78851c-5510-487f-8d8a-9b239acca171" xlink:href="evcm-20211231.xsd#evcm_TermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:to="loc_evcm_TermNotesMember_2e78851c-5510-487f-8d8a-9b239acca171" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AssetPurchaseAgreementMember_de949bd6-13a3-465d-a117-aca554e48c3d" xlink:href="evcm-20211231.xsd#evcm_AssetPurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:to="loc_evcm_AssetPurchaseAgreementMember_de949bd6-13a3-465d-a117-aca554e48c3d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SubordinatedUnsecuredPromissoryNoteServiceNationIncMember_d6d1bd6d-4a6e-4fbf-a723-47a7953ea705" xlink:href="evcm-20211231.xsd#evcm_SubordinatedUnsecuredPromissoryNoteServiceNationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:to="loc_evcm_SubordinatedUnsecuredPromissoryNoteServiceNationIncMember_d6d1bd6d-4a6e-4fbf-a723-47a7953ea705" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SubordinatedUnsecuredPromissoryNoteTechniqueFitnessIncMember_80589ac6-7e96-402e-9502-8d71edbeb49c" xlink:href="evcm-20211231.xsd#evcm_SubordinatedUnsecuredPromissoryNoteTechniqueFitnessIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_80996dae-15bb-40fb-99d1-56f8354ef8d2" xlink:to="loc_evcm_SubordinatedUnsecuredPromissoryNoteTechniqueFitnessIncMember_80589ac6-7e96-402e-9502-8d71edbeb49c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_2c27b20c-8d78-4755-b922-f0e9c8c744ac" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0b045756-3da4-456d-9667-7a94f299af78" xlink:to="loc_us-gaap_VariableRateAxis_2c27b20c-8d78-4755-b922-f0e9c8c744ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_2c27b20c-8d78-4755-b922-f0e9c8c744ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_2c27b20c-8d78-4755-b922-f0e9c8c744ac" xlink:to="loc_us-gaap_VariableRateDomain_2c27b20c-8d78-4755-b922-f0e9c8c744ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_4f0d1f45-2dcb-40c0-b939-13063a627f98" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_2c27b20c-8d78-4755-b922-f0e9c8c744ac" xlink:to="loc_us-gaap_VariableRateDomain_4f0d1f45-2dcb-40c0-b939-13063a627f98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BaseRateOrLondonInterbankOfferedRateLIBORMember_7c9100eb-31ae-4f0a-b8db-016fd8831d5b" xlink:href="evcm-20211231.xsd#evcm_BaseRateOrLondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_4f0d1f45-2dcb-40c0-b939-13063a627f98" xlink:to="loc_evcm_BaseRateOrLondonInterbankOfferedRateLIBORMember_7c9100eb-31ae-4f0a-b8db-016fd8831d5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_94b0e0d4-4d55-4a65-8eab-feff1c8e7206" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0b045756-3da4-456d-9667-7a94f299af78" xlink:to="loc_us-gaap_CreditFacilityAxis_94b0e0d4-4d55-4a65-8eab-feff1c8e7206" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_94b0e0d4-4d55-4a65-8eab-feff1c8e7206_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_94b0e0d4-4d55-4a65-8eab-feff1c8e7206" xlink:to="loc_us-gaap_CreditFacilityDomain_94b0e0d4-4d55-4a65-8eab-feff1c8e7206_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_a7d3a6d9-32cd-4d7e-a6a6-098ca5be89fa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_94b0e0d4-4d55-4a65-8eab-feff1c8e7206" xlink:to="loc_us-gaap_CreditFacilityDomain_a7d3a6d9-32cd-4d7e-a6a6-098ca5be89fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TermLoanMember_a373132c-4228-4aa6-9006-3e19004febd7" xlink:href="evcm-20211231.xsd#evcm_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_a7d3a6d9-32cd-4d7e-a6a6-098ca5be89fa" xlink:to="loc_evcm_TermLoanMember_a373132c-4228-4aa6-9006-3e19004febd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_aeac3dac-5feb-44c7-8e54-89e3b9117377" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_a7d3a6d9-32cd-4d7e-a6a6-098ca5be89fa" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_aeac3dac-5feb-44c7-8e54-89e3b9117377" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/LongTermDebtNarrativeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#LongTermDebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/LongTermDebtNarrativeDetails" xlink:type="extended" id="i99ac6de002ba474aab19a6b74c35b00a_LongTermDebtNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_3cc56d0f-3c70-43f5-881c-be065b00e30c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_DebtInstrumentFairValue_3cc56d0f-3c70-43f5-881c-be065b00e30c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_0320003b-22cc-4574-ac35-b1a2607f5dc2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_0320003b-22cc-4574-ac35-b1a2607f5dc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b6af186a-4723-485a-aff7-02b7dbce89ea" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_b6af186a-4723-485a-aff7-02b7dbce89ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_588fd1ba-aa34-4e55-8ef6-33e3cee5dcf7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_588fd1ba-aa34-4e55-8ef6-33e3cee5dcf7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaidInKindInterest_247ef1d0-61e3-447e-9038-5dcaa2338e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaidInKindInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_PaidInKindInterest_247ef1d0-61e3-447e-9038-5dcaa2338e9d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4457747d-e018-476c-b268-f027fcb4bf22" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_4457747d-e018-476c-b268-f027fcb4bf22" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_97fe4077-b9d8-4b30-9df2-7763547ba936" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_97fe4077-b9d8-4b30-9df2-7763547ba936" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_a64be261-14e5-4b83-8040-87d2a4c08a1b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_a64be261-14e5-4b83-8040-87d2a4c08a1b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_6d2f9e54-77dc-46e2-a41a-6c1b1de51fc8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_6d2f9e54-77dc-46e2-a41a-6c1b1de51fc8" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_DebtInstrumentGrossDiscountPremium_f8b53e46-946d-4feb-9534-d07feb9a0db7" xlink:href="evcm-20211231.xsd#evcm_DebtInstrumentGrossDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_evcm_DebtInstrumentGrossDiscountPremium_f8b53e46-946d-4feb-9534-d07feb9a0db7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_619d6fc3-550e-4722-9482-d30b85b5b6a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_619d6fc3-550e-4722-9482-d30b85b5b6a9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_cc62a268-0c96-4aab-905a-5ba604659f40" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_cc62a268-0c96-4aab-905a-5ba604659f40" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_14bd6d88-969c-43bf-bb19-ffdc0a5db5e4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_LongTermDebt_14bd6d88-969c-43bf-bb19-ffdc0a5db5e4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_e1d3f5c5-7760-4a8a-9418-58b6818c9110" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_e1d3f5c5-7760-4a8a-9418-58b6818c9110" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_e9958c2c-6aa6-49f9-b82d-4542a15c26d2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_DebtInstrumentTerm_e9958c2c-6aa6-49f9-b82d-4542a15c26d2" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal_7cc8f76e-ac93-453a-ade5-be91cb7a063f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal_7cc8f76e-ac93-453a-ade5-be91cb7a063f" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_LongTermDebtExpectedPaidInKindInterest_944816b2-60c0-4b5f-a927-f9966e62a5f9" xlink:href="evcm-20211231.xsd#evcm_LongTermDebtExpectedPaidInKindInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_evcm_LongTermDebtExpectedPaidInKindInterest_944816b2-60c0-4b5f-a927-f9966e62a5f9" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3216b28e-37d1-4bd6-b057-ed787d4a0ce6" xlink:to="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b5eafe98-63be-422e-80e7-282bc66557ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b5eafe98-63be-422e-80e7-282bc66557ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b5eafe98-63be-422e-80e7-282bc66557ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b5eafe98-63be-422e-80e7-282bc66557ae" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_b5eafe98-63be-422e-80e7-282bc66557ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_182be959-8403-42a2-b7cf-f98b03c63394" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_b5eafe98-63be-422e-80e7-282bc66557ae" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_182be959-8403-42a2-b7cf-f98b03c63394" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_5cbb3519-da54-4843-8704-b93d7cc20554" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_182be959-8403-42a2-b7cf-f98b03c63394" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_5cbb3519-da54-4843-8704-b93d7cc20554" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_ed071c0d-b353-4501-9608-8529bbc243fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:to="loc_us-gaap_CreditFacilityAxis_ed071c0d-b353-4501-9608-8529bbc243fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ed071c0d-b353-4501-9608-8529bbc243fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_ed071c0d-b353-4501-9608-8529bbc243fe" xlink:to="loc_us-gaap_CreditFacilityDomain_ed071c0d-b353-4501-9608-8529bbc243fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_7b4692ab-c092-4e8c-9cd2-733ef7d22bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_ed071c0d-b353-4501-9608-8529bbc243fe" xlink:to="loc_us-gaap_CreditFacilityDomain_7b4692ab-c092-4e8c-9cd2-733ef7d22bf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TermLoanMember_8f6fa11e-9abd-4413-935d-33ce111e96e2" xlink:href="evcm-20211231.xsd#evcm_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7b4692ab-c092-4e8c-9cd2-733ef7d22bf2" xlink:to="loc_evcm_TermLoanMember_8f6fa11e-9abd-4413-935d-33ce111e96e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_DelayedDrawTermLoanMember_2a294c8c-d47f-4b11-b8c4-bbb2c7360daa" xlink:href="evcm-20211231.xsd#evcm_DelayedDrawTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7b4692ab-c092-4e8c-9cd2-733ef7d22bf2" xlink:to="loc_evcm_DelayedDrawTermLoanMember_2a294c8c-d47f-4b11-b8c4-bbb2c7360daa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_5f8d86e4-5f99-4a9c-b033-dc8f2b5acb33" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7b4692ab-c092-4e8c-9cd2-733ef7d22bf2" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_5f8d86e4-5f99-4a9c-b033-dc8f2b5acb33" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_8ac5b825-8add-4eb3-94e0-9a10ff5ec58d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7b4692ab-c092-4e8c-9cd2-733ef7d22bf2" xlink:to="loc_us-gaap_LetterOfCreditMember_8ac5b825-8add-4eb3-94e0-9a10ff5ec58d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_926a78fb-7d30-48f1-aba0-e0043674d90d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7b4692ab-c092-4e8c-9cd2-733ef7d22bf2" xlink:to="loc_us-gaap_LineOfCreditMember_926a78fb-7d30-48f1-aba0-e0043674d90d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_395bd55c-f5fc-4625-9ac5-bcde3220e5fa" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:to="loc_srt_RangeAxis_395bd55c-f5fc-4625-9ac5-bcde3220e5fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_395bd55c-f5fc-4625-9ac5-bcde3220e5fa_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_395bd55c-f5fc-4625-9ac5-bcde3220e5fa" xlink:to="loc_srt_RangeMember_395bd55c-f5fc-4625-9ac5-bcde3220e5fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_26684508-b411-448c-970f-03d6bb95f04a" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_395bd55c-f5fc-4625-9ac5-bcde3220e5fa" xlink:to="loc_srt_RangeMember_26684508-b411-448c-970f-03d6bb95f04a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_015266bb-8623-4f95-8b0f-92c266f9ff0f" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_26684508-b411-448c-970f-03d6bb95f04a" xlink:to="loc_srt_MinimumMember_015266bb-8623-4f95-8b0f-92c266f9ff0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ddad7525-2f4f-4227-baea-84c4cb1301ab" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_26684508-b411-448c-970f-03d6bb95f04a" xlink:to="loc_srt_MaximumMember_ddad7525-2f4f-4227-baea-84c4cb1301ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e01182b4-9132-46ff-ad2a-7c9f0db087f2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:to="loc_us-gaap_DebtInstrumentAxis_e01182b4-9132-46ff-ad2a-7c9f0db087f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e01182b4-9132-46ff-ad2a-7c9f0db087f2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e01182b4-9132-46ff-ad2a-7c9f0db087f2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e01182b4-9132-46ff-ad2a-7c9f0db087f2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e01182b4-9132-46ff-ad2a-7c9f0db087f2" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_EquitySponsorsNotesMember_10004310-1e13-439e-8100-3c4cea477c68" xlink:href="evcm-20211231.xsd#evcm_EquitySponsorsNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:to="loc_evcm_EquitySponsorsNotesMember_10004310-1e13-439e-8100-3c4cea477c68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_LegacyTermNotesMember_9dda5366-9c15-45bd-9a19-9c08be7023a6" xlink:href="evcm-20211231.xsd#evcm_LegacyTermNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:to="loc_evcm_LegacyTermNotesMember_9dda5366-9c15-45bd-9a19-9c08be7023a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_LegacySubordinatedNotesMember_5c926bb7-e293-40c3-8914-08e97ca68b8a" xlink:href="evcm-20211231.xsd#evcm_LegacySubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:to="loc_evcm_LegacySubordinatedNotesMember_5c926bb7-e293-40c3-8914-08e97ca68b8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NewTermLoanMember_7636a782-17b6-470e-a692-31adb71962e4" xlink:href="evcm-20211231.xsd#evcm_NewTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:to="loc_evcm_NewTermLoanMember_7636a782-17b6-470e-a692-31adb71962e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NewRevolverMember_656e0f4a-7094-41a2-86d2-27769e6e787b" xlink:href="evcm-20211231.xsd#evcm_NewRevolverMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:to="loc_evcm_NewRevolverMember_656e0f4a-7094-41a2-86d2-27769e6e787b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_CreditFacilityMember_60a755d3-f23a-49fe-ad1a-237b83a7e7ae" xlink:href="evcm-20211231.xsd#evcm_CreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:to="loc_evcm_CreditFacilityMember_60a755d3-f23a-49fe-ad1a-237b83a7e7ae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NewCreditAgreementMember_f3d88b1a-72e0-48ed-b2e3-dadfca79797e" xlink:href="evcm-20211231.xsd#evcm_NewCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_69a69813-4cd8-4d0b-8120-846756f8cdcc" xlink:to="loc_evcm_NewCreditAgreementMember_f3d88b1a-72e0-48ed-b2e3-dadfca79797e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f12e80db-907d-47c9-8f1d-79c5dd4dd8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f12e80db-907d-47c9-8f1d-79c5dd4dd8a7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f12e80db-907d-47c9-8f1d-79c5dd4dd8a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f12e80db-907d-47c9-8f1d-79c5dd4dd8a7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f12e80db-907d-47c9-8f1d-79c5dd4dd8a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_754af79c-910e-4f7f-b181-b552e1e412e5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f12e80db-907d-47c9-8f1d-79c5dd4dd8a7" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_754af79c-910e-4f7f-b181-b552e1e412e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_bb139290-0f08-4b2e-a8f9-6ad008433724" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_754af79c-910e-4f7f-b181-b552e1e412e5" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_bb139290-0f08-4b2e-a8f9-6ad008433724" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_b6a71de5-0780-4d3e-9ada-5f5c6270f789" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_754af79c-910e-4f7f-b181-b552e1e412e5" xlink:to="loc_us-gaap_SubordinatedDebtMember_b6a71de5-0780-4d3e-9ada-5f5c6270f789" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_0741ee47-60b1-420f-bca6-d9b9568e1bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_0741ee47-60b1-420f-bca6-d9b9568e1bd3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_0741ee47-60b1-420f-bca6-d9b9568e1bd3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0741ee47-60b1-420f-bca6-d9b9568e1bd3" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_0741ee47-60b1-420f-bca6-d9b9568e1bd3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_b746b86c-4a08-4fc9-a9b5-3043889b065f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0741ee47-60b1-420f-bca6-d9b9568e1bd3" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_b746b86c-4a08-4fc9-a9b5-3043889b065f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_53e5b645-a0f7-4dae-995c-2baa7d437130" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_b746b86c-4a08-4fc9-a9b5-3043889b065f" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_53e5b645-a0f7-4dae-995c-2baa7d437130" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_cd90ef34-20c7-4658-9b3b-78ccf3a65e8d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_53e5b645-a0f7-4dae-995c-2baa7d437130" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_cd90ef34-20c7-4658-9b3b-78ccf3a65e8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_8043c652-c8dc-4a66-a63a-2c4684a88385" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_978e6f5e-b745-4c04-af11-8a5b68cae379" xlink:to="loc_us-gaap_VariableRateAxis_8043c652-c8dc-4a66-a63a-2c4684a88385" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_8043c652-c8dc-4a66-a63a-2c4684a88385_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_8043c652-c8dc-4a66-a63a-2c4684a88385" xlink:to="loc_us-gaap_VariableRateDomain_8043c652-c8dc-4a66-a63a-2c4684a88385_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_dc87b435-11d5-4fc1-85c9-9379fb1a8045" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_8043c652-c8dc-4a66-a63a-2c4684a88385" xlink:to="loc_us-gaap_VariableRateDomain_dc87b435-11d5-4fc1-85c9-9379fb1a8045" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_FederalReserveBankOfNewYorkMember_c958894e-be6b-4845-8bcc-c0b981089010" xlink:href="evcm-20211231.xsd#evcm_FederalReserveBankOfNewYorkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_dc87b435-11d5-4fc1-85c9-9379fb1a8045" xlink:to="loc_evcm_FederalReserveBankOfNewYorkMember_c958894e-be6b-4845-8bcc-c0b981089010" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_1073d0ec-43b9-4d04-b4d6-aa2483e799fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_dc87b435-11d5-4fc1-85c9-9379fb1a8045" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_1073d0ec-43b9-4d04-b4d6-aa2483e799fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_EurocurrencyMember_13613051-e7de-4939-a21b-7d42415be3fe" xlink:href="evcm-20211231.xsd#evcm_EurocurrencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_dc87b435-11d5-4fc1-85c9-9379fb1a8045" xlink:to="loc_evcm_EurocurrencyMember_13613051-e7de-4939-a21b-7d42415be3fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_7e3960e4-2459-4d86-badd-15437df73ec2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_dc87b435-11d5-4fc1-85c9-9379fb1a8045" xlink:to="loc_us-gaap_BaseRateMember_7e3960e4-2459-4d86-badd-15437df73ec2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/EquityNarrativeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#EquityNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/EquityNarrativeDetails" xlink:type="extended" id="i8c108872af59408ab1b1e517205e2aab_EquityNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquitySharesConversionOfConvertibleSecurities_16f34421-47df-498d-b057-709b169420fe" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquitySharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_evcm_TemporaryEquitySharesConversionOfConvertibleSecurities_16f34421-47df-498d-b057-709b169420fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityDeemedDividendDistribution_f3475959-771c-4d56-a620-81dc4edfcc2a" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityDeemedDividendDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_evcm_TemporaryEquityDeemedDividendDistribution_f3475959-771c-4d56-a620-81dc4edfcc2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_5b4a54e3-5c93-4a4e-975a-2b7f0ffe4151" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_5b4a54e3-5c93-4a4e-975a-2b7f0ffe4151" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesIssued_eed72763-594c-4308-a088-bfe89dfe4ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_TemporaryEquitySharesIssued_eed72763-594c-4308-a088-bfe89dfe4ff3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_18693481-d273-41f9-892b-30830fdba8b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_18693481-d273-41f9-892b-30830fdba8b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_a2b48fe5-683c-4b88-8d08-b4db7e24f790" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_a2b48fe5-683c-4b88-8d08-b4db7e24f790" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_09170200-1a96-4463-bff7-d5cc3cbc3c99" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_09170200-1a96-4463-bff7-d5cc3cbc3c99" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_ae01383c-9505-4ee7-af30-76d81c7d36b5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_ae01383c-9505-4ee7-af30-76d81c7d36b5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_30c52593-7e24-4286-9087-be0bd02ccd86" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_30c52593-7e24-4286-9087-be0bd02ccd86" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_0bc13e8a-0cd6-46d9-bad2-6a6553173b15" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_0bc13e8a-0cd6-46d9-bad2-6a6553173b15" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_f204a31d-8bc6-4084-9705-8bc3f6fbf215" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_f204a31d-8bc6-4084-9705-8bc3f6fbf215" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityDividendRatePercentage_db1619b9-c12a-4365-b8e8-97d19d095efa" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_evcm_TemporaryEquityDividendRatePercentage_db1619b9-c12a-4365-b8e8-97d19d095efa" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssuedPricePerShare_5ba7bdc5-5d33-4513-b72f-b0c0a9bb36e1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharesIssuedPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_SharesIssuedPricePerShare_5ba7bdc5-5d33-4513-b72f-b0c0a9bb36e1" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityAccumulatedAndUndeclaredDividends_69c4d922-c51e-4b01-9f64-3e3dc0c70b81" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityAccumulatedAndUndeclaredDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_evcm_TemporaryEquityAccumulatedAndUndeclaredDividends_69c4d922-c51e-4b01-9f64-3e3dc0c70b81" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_021ea815-e91d-48ca-b392-9a0b4c3924be" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_021ea815-e91d-48ca-b392-9a0b4c3924be" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesAuthorized_662e4038-67d8-441e-baaa-a3c3b49eae79" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_TemporaryEquitySharesAuthorized_662e4038-67d8-441e-baaa-a3c3b49eae79" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_5622f4f5-205e-4e1b-8e9c-9ed8295e52c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_5622f4f5-205e-4e1b-8e9c-9ed8295e52c5" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_9a3fdc35-4208-4cd9-a3d8-b915a67ecdc3" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_evcm_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_9a3fdc35-4208-4cd9-a3d8-b915a67ecdc3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock_c86ae76b-2d6f-4949-b77c-2651845fe6c1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock_c86ae76b-2d6f-4949-b77c-2651845fe6c1" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SharesAuthorizedCommonAndPreferredStock_de2149d2-bc2e-45c3-ad76-76aa766782e1" xlink:href="evcm-20211231.xsd#evcm_SharesAuthorizedCommonAndPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_evcm_SharesAuthorizedCommonAndPreferredStock_de2149d2-bc2e-45c3-ad76-76aa766782e1" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_6030ad51-0e9a-4611-8907-1acca6196ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_6030ad51-0e9a-4611-8907-1acca6196ffc" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_4906c618-abd2-48bd-9515-55deed415430" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_4906c618-abd2-48bd-9515-55deed415430" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_c340e754-5b99-4d70-8160-d0bf002224c5" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_c340e754-5b99-4d70-8160-d0bf002224c5" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_7659ca5a-5f61-4e48-93d4-2253baa9b4aa" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_7659ca5a-5f61-4e48-93d4-2253baa9b4aa" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_cc9e6aca-73e4-4493-a022-af9a88d8dbc7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_c8c85ea1-3251-46ed-bbec-bcf05828137e" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_cc9e6aca-73e4-4493-a022-af9a88d8dbc7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_464c8cd5-2daa-4692-b796-a08edd4c011e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_cc9e6aca-73e4-4493-a022-af9a88d8dbc7" xlink:to="loc_us-gaap_StatementClassOfStockAxis_464c8cd5-2daa-4692-b796-a08edd4c011e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_464c8cd5-2daa-4692-b796-a08edd4c011e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_464c8cd5-2daa-4692-b796-a08edd4c011e" xlink:to="loc_us-gaap_ClassOfStockDomain_464c8cd5-2daa-4692-b796-a08edd4c011e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_792d4189-5428-49d5-b828-3505256154ce" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_464c8cd5-2daa-4692-b796-a08edd4c011e" xlink:to="loc_us-gaap_ClassOfStockDomain_792d4189-5428-49d5-b828-3505256154ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesAConvertiblePreferredStockMember_09c42c44-6e82-46b2-9d38-edbb25c3f027" xlink:href="evcm-20211231.xsd#evcm_SeriesAConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_792d4189-5428-49d5-b828-3505256154ce" xlink:to="loc_evcm_SeriesAConvertiblePreferredStockMember_09c42c44-6e82-46b2-9d38-edbb25c3f027" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesBConvertiblePreferredStockMember_15502c43-dcc0-40f4-b16b-949ce1db1722" xlink:href="evcm-20211231.xsd#evcm_SeriesBConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_792d4189-5428-49d5-b828-3505256154ce" xlink:to="loc_evcm_SeriesBConvertiblePreferredStockMember_15502c43-dcc0-40f4-b16b-949ce1db1722" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesCConvertiblePreferredStockMember_f01e39a8-5402-446c-8a6d-4643fecac2cf" xlink:href="evcm-20211231.xsd#evcm_SeriesCConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_792d4189-5428-49d5-b828-3505256154ce" xlink:to="loc_evcm_SeriesCConvertiblePreferredStockMember_f01e39a8-5402-446c-8a6d-4643fecac2cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_22095151-240a-4883-b146-d880d382cf24" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_cc9e6aca-73e4-4493-a022-af9a88d8dbc7" xlink:to="loc_srt_RangeAxis_22095151-240a-4883-b146-d880d382cf24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_22095151-240a-4883-b146-d880d382cf24_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_22095151-240a-4883-b146-d880d382cf24" xlink:to="loc_srt_RangeMember_22095151-240a-4883-b146-d880d382cf24_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a761224e-57fd-43dc-a20a-b932a824a072" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_22095151-240a-4883-b146-d880d382cf24" xlink:to="loc_srt_RangeMember_a761224e-57fd-43dc-a20a-b932a824a072" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_e35cf926-e31c-4c8d-a441-000518cfac83" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a761224e-57fd-43dc-a20a-b932a824a072" xlink:to="loc_srt_MinimumMember_e35cf926-e31c-4c8d-a441-000518cfac83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_ba16c695-cd15-4860-a302-02eac1657fd4" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_a761224e-57fd-43dc-a20a-b932a824a072" xlink:to="loc_srt_MaximumMember_ba16c695-cd15-4860-a302-02eac1657fd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_3061e576-5806-4fcf-920b-2b71b9852913" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_cc9e6aca-73e4-4493-a022-af9a88d8dbc7" xlink:to="loc_srt_TitleOfIndividualAxis_3061e576-5806-4fcf-920b-2b71b9852913" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3061e576-5806-4fcf-920b-2b71b9852913_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_3061e576-5806-4fcf-920b-2b71b9852913" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_3061e576-5806-4fcf-920b-2b71b9852913_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_8bb841d0-0a99-4cbd-8919-27d4c98941e7" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_3061e576-5806-4fcf-920b-2b71b9852913" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_8bb841d0-0a99-4cbd-8919-27d4c98941e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_EmployeeMember_71b01278-ddbb-477e-8c76-bf292f8c3ba7" xlink:href="evcm-20211231.xsd#evcm_EmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_8bb841d0-0a99-4cbd-8919-27d4c98941e7" xlink:to="loc_evcm_EmployeeMember_71b01278-ddbb-477e-8c76-bf292f8c3ba7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/StockBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#StockBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended" id="ieb8192c8f61c4c0a90660818fcf9b1d1_StockBasedCompensationNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_317f36c2-0aa2-41f0-95bf-c282b94362db" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_317f36c2-0aa2-41f0-95bf-c282b94362db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_42c73b7f-6ccb-4304-a485-06b1d6efca92" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_42c73b7f-6ccb-4304-a485-06b1d6efca92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1609fa0d-9fa6-497d-964f-7d93db36c879" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_1609fa0d-9fa6-497d-964f-7d93db36c879" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_fd85fd7c-89fd-4795-bfdf-8b6b306f0e2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_fd85fd7c-89fd-4795-bfdf-8b6b306f0e2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_64362b1e-d47e-4543-9cf7-f22144a50815" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_64362b1e-d47e-4543-9cf7-f22144a50815" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsMinimumInitialPublicOfferingPricePerShare_06ad03af-a1ec-4990-9b67-19120e376e21" xlink:href="evcm-20211231.xsd#evcm_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsMinimumInitialPublicOfferingPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_evcm_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsMinimumInitialPublicOfferingPricePerShare_06ad03af-a1ec-4990-9b67-19120e376e21" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_16937fb2-4a29-419e-89a3-7c95188c22a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_16937fb2-4a29-419e-89a3-7c95188c22a6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_82a205af-ab34-4274-a979-9f0fc5e2b9e0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_82a205af-ab34-4274-a979-9f0fc5e2b9e0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_25cfc238-58ad-41c8-8dad-e6c15c616ed2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_25cfc238-58ad-41c8-8dad-e6c15c616ed2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_b2811af1-9051-4fe4-9cd9-ac3591433b95" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_b2811af1-9051-4fe4-9cd9-ac3591433b95" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_98e78920-f4f2-41b6-ae2a-230ce6af9563" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_98e78920-f4f2-41b6-ae2a-230ce6af9563" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_f204040f-bd90-416a-936b-b6c64801b4ae" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_f204040f-bd90-416a-936b-b6c64801b4ae" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_e62a8990-99db-4653-bbaa-a8162e027d84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_e62a8990-99db-4653-bbaa-a8162e027d84" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_f146a2dc-04ae-4c56-95b2-8944b9c36927" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_f146a2dc-04ae-4c56-95b2-8944b9c36927" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesIssued_e7b8e31f-467b-434e-aee8-396e74fad22a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquitySharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_TemporaryEquitySharesIssued_e7b8e31f-467b-434e-aee8-396e74fad22a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock_3f815853-5f94-4014-b2a5-f26c631aab66" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock_3f815853-5f94-4014-b2a5-f26c631aab66" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_06d00164-e4c6-4e3a-b815-25288bbf9f2c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_06d00164-e4c6-4e3a-b815-25288bbf9f2c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_8b4d55d7-df96-4b50-b2a7-57b5040925fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_8b4d55d7-df96-4b50-b2a7-57b5040925fc" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c17fb177-51d5-46e8-bffc-5a6963fb865a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_0646a240-f5a3-45dd-a0db-914edabea85e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c17fb177-51d5-46e8-bffc-5a6963fb865a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_8ffd365e-7eae-4714-89e1-4805cc0b19a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c17fb177-51d5-46e8-bffc-5a6963fb865a" xlink:to="loc_us-gaap_AwardTypeAxis_8ffd365e-7eae-4714-89e1-4805cc0b19a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8ffd365e-7eae-4714-89e1-4805cc0b19a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8ffd365e-7eae-4714-89e1-4805cc0b19a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_8ffd365e-7eae-4714-89e1-4805cc0b19a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8ffd365e-7eae-4714-89e1-4805cc0b19a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ShareBasedPaymentArrangementTimeBasedOptionMember_630ea520-686f-4d20-a1dc-ede47fde455c" xlink:href="evcm-20211231.xsd#evcm_ShareBasedPaymentArrangementTimeBasedOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:to="loc_evcm_ShareBasedPaymentArrangementTimeBasedOptionMember_630ea520-686f-4d20-a1dc-ede47fde455c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ShareBasedPaymentArrangementPerformanceBasedOptionMember_1d6f1750-e16e-49a1-89b4-f9d5cf172b4a" xlink:href="evcm-20211231.xsd#evcm_ShareBasedPaymentArrangementPerformanceBasedOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:to="loc_evcm_ShareBasedPaymentArrangementPerformanceBasedOptionMember_1d6f1750-e16e-49a1-89b4-f9d5cf172b4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ShareBasedPaymentArrangementMarketConditionBasedOptionMember_3d74523a-6985-4790-8f99-00cc6925700d" xlink:href="evcm-20211231.xsd#evcm_ShareBasedPaymentArrangementMarketConditionBasedOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:to="loc_evcm_ShareBasedPaymentArrangementMarketConditionBasedOptionMember_3d74523a-6985-4790-8f99-00cc6925700d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_a65da3fd-654b-4f3f-8b0d-ed7bef74f99e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:to="loc_us-gaap_EmployeeStockOptionMember_a65da3fd-654b-4f3f-8b0d-ed7bef74f99e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RestrictedStockAwardsFundingMember_cc5a1ac0-7cb6-4f5f-9e69-87be4e6c9ccb" xlink:href="evcm-20211231.xsd#evcm_RestrictedStockAwardsFundingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:to="loc_evcm_RestrictedStockAwardsFundingMember_cc5a1ac0-7cb6-4f5f-9e69-87be4e6c9ccb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RestrictedStockUnitsTimeVestingMember_f044759f-b029-4e7f-9e3a-3a3907e3e536" xlink:href="evcm-20211231.xsd#evcm_RestrictedStockUnitsTimeVestingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3944dc5f-9a79-4ece-ae2f-0d59fdfabfdc" xlink:to="loc_evcm_RestrictedStockUnitsTimeVestingMember_f044759f-b029-4e7f-9e3a-3a3907e3e536" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_6d6c323f-0dd0-474e-b696-3bfefa6a5dc0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c17fb177-51d5-46e8-bffc-5a6963fb865a" xlink:to="loc_us-gaap_VestingAxis_6d6c323f-0dd0-474e-b696-3bfefa6a5dc0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_6d6c323f-0dd0-474e-b696-3bfefa6a5dc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_6d6c323f-0dd0-474e-b696-3bfefa6a5dc0" xlink:to="loc_us-gaap_VestingDomain_6d6c323f-0dd0-474e-b696-3bfefa6a5dc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_09711bab-9a02-4dd0-85dc-17d6fc2819c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_6d6c323f-0dd0-474e-b696-3bfefa6a5dc0" xlink:to="loc_us-gaap_VestingDomain_09711bab-9a02-4dd0-85dc-17d6fc2819c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_1a3533be-c53e-4a9f-b52c-a64e75a7fb4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_09711bab-9a02-4dd0-85dc-17d6fc2819c4" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_1a3533be-c53e-4a9f-b52c-a64e75a7fb4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_83c19bf0-0ea6-4739-a104-c6faa3274dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_09711bab-9a02-4dd0-85dc-17d6fc2819c4" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_83c19bf0-0ea6-4739-a104-c6faa3274dbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_800d82f1-fe70-4bfc-8a4a-0f508e85c0cc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c17fb177-51d5-46e8-bffc-5a6963fb865a" xlink:to="loc_us-gaap_PlanNameAxis_800d82f1-fe70-4bfc-8a4a-0f508e85c0cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_800d82f1-fe70-4bfc-8a4a-0f508e85c0cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_800d82f1-fe70-4bfc-8a4a-0f508e85c0cc" xlink:to="loc_us-gaap_PlanNameDomain_800d82f1-fe70-4bfc-8a4a-0f508e85c0cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b8a7a266-6183-4ece-81a3-7244b32a822e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_800d82f1-fe70-4bfc-8a4a-0f508e85c0cc" xlink:to="loc_us-gaap_PlanNameDomain_b8a7a266-6183-4ece-81a3-7244b32a822e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_IncentiveAwardPlan2021Member_647f9003-cbc0-43ae-9a6b-74d4ecc0fe62" xlink:href="evcm-20211231.xsd#evcm_IncentiveAwardPlan2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b8a7a266-6183-4ece-81a3-7244b32a822e" xlink:to="loc_evcm_IncentiveAwardPlan2021Member_647f9003-cbc0-43ae-9a6b-74d4ecc0fe62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_EmployeeStockPurchasePlan2021Member_842fc6ad-87c1-4c0c-9c87-7ebd1e337360" xlink:href="evcm-20211231.xsd#evcm_EmployeeStockPurchasePlan2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b8a7a266-6183-4ece-81a3-7244b32a822e" xlink:to="loc_evcm_EmployeeStockPurchasePlan2021Member_842fc6ad-87c1-4c0c-9c87-7ebd1e337360" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_986e93e3-7527-4ea6-9591-0406bc150eef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c17fb177-51d5-46e8-bffc-5a6963fb865a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_986e93e3-7527-4ea6-9591-0406bc150eef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_986e93e3-7527-4ea6-9591-0406bc150eef_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_986e93e3-7527-4ea6-9591-0406bc150eef" xlink:to="loc_us-gaap_ClassOfStockDomain_986e93e3-7527-4ea6-9591-0406bc150eef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_e227757d-14ff-4e25-93f7-bc55e0c9153b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_986e93e3-7527-4ea6-9591-0406bc150eef" xlink:to="loc_us-gaap_ClassOfStockDomain_e227757d-14ff-4e25-93f7-bc55e0c9153b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesCConvertiblePreferredStockMember_807fc014-2964-4286-abd3-3d36262a106e" xlink:href="evcm-20211231.xsd#evcm_SeriesCConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_e227757d-14ff-4e25-93f7-bc55e0c9153b" xlink:to="loc_evcm_SeriesCConvertiblePreferredStockMember_807fc014-2964-4286-abd3-3d36262a106e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b28149f7-e524-45ee-b826-4af229e22e6b" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c17fb177-51d5-46e8-bffc-5a6963fb865a" xlink:to="loc_srt_RangeAxis_b28149f7-e524-45ee-b826-4af229e22e6b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b28149f7-e524-45ee-b826-4af229e22e6b_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b28149f7-e524-45ee-b826-4af229e22e6b" xlink:to="loc_srt_RangeMember_b28149f7-e524-45ee-b826-4af229e22e6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_39272b30-349a-4dc4-a325-2e7df5227b6e" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b28149f7-e524-45ee-b826-4af229e22e6b" xlink:to="loc_srt_RangeMember_39272b30-349a-4dc4-a325-2e7df5227b6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2a301fcf-473e-45db-8e0f-d1f5befe24e3" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_39272b30-349a-4dc4-a325-2e7df5227b6e" xlink:to="loc_srt_MaximumMember_2a301fcf-473e-45db-8e0f-d1f5befe24e3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/StockBasedCompensationRestrictedStockAwardsActivityDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#StockBasedCompensationRestrictedStockAwardsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/StockBasedCompensationRestrictedStockAwardsActivityDetails" xlink:type="extended" id="i00a0f920a79043a5b64a0bb9cf390faf_StockBasedCompensationRestrictedStockAwardsActivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_45a075d9-283a-4367-bdbf-40f8cfb258a4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7e3f8036-b924-4929-b2ab-c9e45636fd34" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_45a075d9-283a-4367-bdbf-40f8cfb258a4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7e3f8036-b924-4929-b2ab-c9e45636fd34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5ea4069f-d84d-4850-b4ee-5aa61ee33321" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7e3f8036-b924-4929-b2ab-c9e45636fd34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_5ea4069f-d84d-4850-b4ee-5aa61ee33321" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d84e7919-b47e-4d37-9937-ce46149b57b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7e3f8036-b924-4929-b2ab-c9e45636fd34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d84e7919-b47e-4d37-9937-ce46149b57b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_85f97b84-1c6b-486e-91dd-629ad882d20f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7e3f8036-b924-4929-b2ab-c9e45636fd34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_85f97b84-1c6b-486e-91dd-629ad882d20f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_674760f7-8eba-4353-b238-af7ace27c713" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_7e3f8036-b924-4929-b2ab-c9e45636fd34" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_674760f7-8eba-4353-b238-af7ace27c713" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_4755fc25-9e34-433f-8237-5d5d254d36d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6cf51c7b-e5b5-4ad5-b436-91e1353683cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_45a075d9-283a-4367-bdbf-40f8cfb258a4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6cf51c7b-e5b5-4ad5-b436-91e1353683cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_0fc913ee-f2b4-4442-8a11-adad445d5941" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6cf51c7b-e5b5-4ad5-b436-91e1353683cd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_0fc913ee-f2b4-4442-8a11-adad445d5941" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b0d2abc1-8fbc-4305-84e8-9320eab44bc4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6cf51c7b-e5b5-4ad5-b436-91e1353683cd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_b0d2abc1-8fbc-4305-84e8-9320eab44bc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6113284c-9bc9-42d5-963f-663542bff44c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6cf51c7b-e5b5-4ad5-b436-91e1353683cd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_6113284c-9bc9-42d5-963f-663542bff44c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b22932ee-ffd0-4c5d-ba35-79e37d878838" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_6cf51c7b-e5b5-4ad5-b436-91e1353683cd" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_b22932ee-ffd0-4c5d-ba35-79e37d878838" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_8d2b717a-b2da-41ce-aa3f-00697d25b9fb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7940d338-3ade-49c5-8ae3-a403df6d6987" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_45a075d9-283a-4367-bdbf-40f8cfb258a4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7940d338-3ade-49c5-8ae3-a403df6d6987" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e102a5bd-6b4f-46af-b74d-ef4007880a60" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7940d338-3ade-49c5-8ae3-a403df6d6987" xlink:to="loc_us-gaap_AwardTypeAxis_e102a5bd-6b4f-46af-b74d-ef4007880a60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e102a5bd-6b4f-46af-b74d-ef4007880a60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_e102a5bd-6b4f-46af-b74d-ef4007880a60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_e102a5bd-6b4f-46af-b74d-ef4007880a60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5d4de560-5dd2-455d-b45c-8624d2280332" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_e102a5bd-6b4f-46af-b74d-ef4007880a60" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5d4de560-5dd2-455d-b45c-8624d2280332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RestrictedStockAwardsFundingMember_03ea8f52-329f-4ae8-88cf-08901ab29775" xlink:href="evcm-20211231.xsd#evcm_RestrictedStockAwardsFundingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5d4de560-5dd2-455d-b45c-8624d2280332" xlink:to="loc_evcm_RestrictedStockAwardsFundingMember_03ea8f52-329f-4ae8-88cf-08901ab29775" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RestrictedStockUnitsTimeVestingMember_81d0cc4e-b365-4eea-90bd-66e3c7db38cf" xlink:href="evcm-20211231.xsd#evcm_RestrictedStockUnitsTimeVestingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_5d4de560-5dd2-455d-b45c-8624d2280332" xlink:to="loc_evcm_RestrictedStockUnitsTimeVestingMember_81d0cc4e-b365-4eea-90bd-66e3c7db38cf" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/StockBasedCompensationStockbasedCompensationExpenseDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#StockBasedCompensationStockbasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/StockBasedCompensationStockbasedCompensationExpenseDetails" xlink:type="extended" id="ibe152cfb88884a50ba4a89612c56e207_StockBasedCompensationStockbasedCompensationExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f569f1d6-a98a-4f5a-8a70-52a89e9048b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_31777b9d-45d2-44ce-b81a-7544425295d0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f569f1d6-a98a-4f5a-8a70-52a89e9048b8" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_31777b9d-45d2-44ce-b81a-7544425295d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_f25bef90-95b3-473d-9424-068e9bee62dc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_f569f1d6-a98a-4f5a-8a70-52a89e9048b8" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_f25bef90-95b3-473d-9424-068e9bee62dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_15747c85-1845-4319-923b-512243b5fe80" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_f25bef90-95b3-473d-9424-068e9bee62dc" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_15747c85-1845-4319-923b-512243b5fe80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_15747c85-1845-4319-923b-512243b5fe80_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_15747c85-1845-4319-923b-512243b5fe80" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_15747c85-1845-4319-923b-512243b5fe80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a8ab5935-a11f-4d32-80c1-56da211ba36d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_15747c85-1845-4319-923b-512243b5fe80" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a8ab5935-a11f-4d32-80c1-56da211ba36d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_a7e9c5a5-4d9b-47bf-95ea-b98b205d4906" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8ab5935-a11f-4d32-80c1-56da211ba36d" xlink:to="loc_us-gaap_CostOfSalesMember_a7e9c5a5-4d9b-47bf-95ea-b98b205d4906" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_8fa2254f-0be5-45e0-b28d-dc0cac5c4775" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8ab5935-a11f-4d32-80c1-56da211ba36d" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_8fa2254f-0be5-45e0-b28d-dc0cac5c4775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_200b9df5-4141-4790-addb-ffbec7356da4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8ab5935-a11f-4d32-80c1-56da211ba36d" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_200b9df5-4141-4790-addb-ffbec7356da4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_fc798979-b24d-4bf5-86fe-75d1b754d0a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a8ab5935-a11f-4d32-80c1-56da211ba36d" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_fc798979-b24d-4bf5-86fe-75d1b754d0a9" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/NetLossPerShareAttributabletoCommonStockholdersScheduleofNetLossPerShareDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#NetLossPerShareAttributabletoCommonStockholdersScheduleofNetLossPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/NetLossPerShareAttributabletoCommonStockholdersScheduleofNetLossPerShareDetails" xlink:type="extended" id="ie6fcf887e1f74d30a97125e1d07b2270_NetLossPerShareAttributabletoCommonStockholdersScheduleofNetLossPerShareDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_406cbfed-3ba3-4f33-94d1-d6e46aba7926" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_406cbfed-3ba3-4f33-94d1-d6e46aba7926" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_22df8697-9d37-44f2-8735-6758a64fea87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:to="loc_us-gaap_NetIncomeLoss_22df8697-9d37-44f2-8735-6758a64fea87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_TemporaryEquityDividendsUndeclared_d5011876-4b3a-4bac-a976-38b767944fcd" xlink:href="evcm-20211231.xsd#evcm_TemporaryEquityDividendsUndeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:to="loc_evcm_TemporaryEquityDividendsUndeclared_d5011876-4b3a-4bac-a976-38b767944fcd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment_e6cb7b3d-f69f-422d-9a53-3428bc45cf5b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:to="loc_us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment_e6cb7b3d-f69f-422d-9a53-3428bc45cf5b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ConvertiblePreferredStockDeemedDividendDistribution_a3d4a15b-c223-494a-ab3d-810e10a28584" xlink:href="evcm-20211231.xsd#evcm_ConvertiblePreferredStockDeemedDividendDistribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:to="loc_evcm_ConvertiblePreferredStockDeemedDividendDistribution_a3d4a15b-c223-494a-ab3d-810e10a28584" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_e41f5d97-1867-4c03-a2cb-392784ac3346" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_e41f5d97-1867-4c03-a2cb-392784ac3346" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_df303857-a560-4001-80be-62c42d421f5d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDilutedAbstract_80028727-0ed1-4c2d-a289-2a6a3a06c422" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_df303857-a560-4001-80be-62c42d421f5d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_93dbc68b-b2b8-401e-8ae1-26167d176965" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_406cbfed-3ba3-4f33-94d1-d6e46aba7926" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_93dbc68b-b2b8-401e-8ae1-26167d176965" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_bd082507-acc7-4385-8ab5-1035fd6f8d14" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_93dbc68b-b2b8-401e-8ae1-26167d176965" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_bd082507-acc7-4385-8ab5-1035fd6f8d14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_039623df-7b14-4061-9376-be2f85214d88" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_93dbc68b-b2b8-401e-8ae1-26167d176965" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_039623df-7b14-4061-9376-be2f85214d88" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_b40d541d-14f8-4e2d-91cd-6754ca181bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_406cbfed-3ba3-4f33-94d1-d6e46aba7926" xlink:to="loc_us-gaap_EarningsPerShareBasic_b40d541d-14f8-4e2d-91cd-6754ca181bfc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_91acea2a-b62e-4c76-8d0d-41d3187a7074" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_406cbfed-3ba3-4f33-94d1-d6e46aba7926" xlink:to="loc_us-gaap_EarningsPerShareDiluted_91acea2a-b62e-4c76-8d0d-41d3187a7074" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_99233369-7105-4d2e-b78a-e8367bf85c05" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_406cbfed-3ba3-4f33-94d1-d6e46aba7926" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_99233369-7105-4d2e-b78a-e8367bf85c05" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_24bd6035-610a-45ce-9197-03e3447569c0" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_99233369-7105-4d2e-b78a-e8367bf85c05" xlink:to="loc_us-gaap_DividendsAxis_24bd6035-610a-45ce-9197-03e3447569c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_24bd6035-610a-45ce-9197-03e3447569c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DividendsAxis_24bd6035-610a-45ce-9197-03e3447569c0" xlink:to="loc_us-gaap_DividendsDomain_24bd6035-610a-45ce-9197-03e3447569c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_68b2073e-19c6-46c2-9e5b-94307fe9c225" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DividendsAxis_24bd6035-610a-45ce-9197-03e3447569c0" xlink:to="loc_us-gaap_DividendsDomain_68b2073e-19c6-46c2-9e5b-94307fe9c225" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NonEmployeeSaleOfSharesMember_8ce5ea30-a715-47c5-a62e-8eb2caa4e16d" xlink:href="evcm-20211231.xsd#evcm_NonEmployeeSaleOfSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_68b2073e-19c6-46c2-9e5b-94307fe9c225" xlink:to="loc_evcm_NonEmployeeSaleOfSharesMember_8ce5ea30-a715-47c5-a62e-8eb2caa4e16d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_SeriesAAndBStockExchangeMember_d51731da-5431-4e85-a63c-1f702564803e" xlink:href="evcm-20211231.xsd#evcm_SeriesAAndBStockExchangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_68b2073e-19c6-46c2-9e5b-94307fe9c225" xlink:to="loc_evcm_SeriesAAndBStockExchangeMember_d51731da-5431-4e85-a63c-1f702564803e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/NetLossPerShareAttributabletoCommonStockholdersAntidilutiveCommonStockExcludedfromComputationofDilutedNetLossPerShareDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#NetLossPerShareAttributabletoCommonStockholdersAntidilutiveCommonStockExcludedfromComputationofDilutedNetLossPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/NetLossPerShareAttributabletoCommonStockholdersAntidilutiveCommonStockExcludedfromComputationofDilutedNetLossPerShareDetails" xlink:type="extended" id="i4214718cf214458989d4f36be0df6ec7_NetLossPerShareAttributabletoCommonStockholdersAntidilutiveCommonStockExcludedfromComputationofDilutedNetLossPerShareDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6dbd0d9f-d39a-49de-a99b-7febdf4d21ee" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e05f9634-9e71-42cc-9de9-79427a017269" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6dbd0d9f-d39a-49de-a99b-7febdf4d21ee" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_e05f9634-9e71-42cc-9de9-79427a017269" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_3cdd1d62-c932-46ef-9371-a751d0fa244d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_6dbd0d9f-d39a-49de-a99b-7febdf4d21ee" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_3cdd1d62-c932-46ef-9371-a751d0fa244d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_56d31754-4561-4680-8de1-ce66e1ef289e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_3cdd1d62-c932-46ef-9371-a751d0fa244d" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_56d31754-4561-4680-8de1-ce66e1ef289e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_56d31754-4561-4680-8de1-ce66e1ef289e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_56d31754-4561-4680-8de1-ce66e1ef289e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_56d31754-4561-4680-8de1-ce66e1ef289e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_63902166-43c1-4fa7-8378-9061d941308c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_56d31754-4561-4680-8de1-ce66e1ef289e" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_63902166-43c1-4fa7-8378-9061d941308c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember_5e6479d1-e535-47f5-8f55-5df552f3ea3f" xlink:href="evcm-20211231.xsd#evcm_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_63902166-43c1-4fa7-8378-9061d941308c" xlink:to="loc_evcm_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember_5e6479d1-e535-47f5-8f55-5df552f3ea3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertiblePreferredStockMember_5b34cd41-ca98-41e6-956b-3be2b9c8ff05" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_63902166-43c1-4fa7-8378-9061d941308c" xlink:to="loc_us-gaap_ConvertiblePreferredStockMember_5b34cd41-ca98-41e6-956b-3be2b9c8ff05" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/FairValueofFinancialInstrumentsFinancialAssetsandLiabilitiesatFairValueOnaRecurringBasisDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#FairValueofFinancialInstrumentsFinancialAssetsandLiabilitiesatFairValueOnaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/FairValueofFinancialInstrumentsFinancialAssetsandLiabilitiesatFairValueOnaRecurringBasisDetails" xlink:type="extended" id="i528282661022477f945f8e610059c8f6_FairValueofFinancialInstrumentsFinancialAssetsandLiabilitiesatFairValueOnaRecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_eaef3aa3-424f-4127-a3fc-64f2128e2491" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_0d8175a3-6a76-418f-9d5b-64f2a3f09609" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_eaef3aa3-424f-4127-a3fc-64f2128e2491" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_0d8175a3-6a76-418f-9d5b-64f2a3f09609" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_38060461-be16-4b93-9d3b-20928f2aa4cd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_0d8175a3-6a76-418f-9d5b-64f2a3f09609" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_38060461-be16-4b93-9d3b-20928f2aa4cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_b237d858-9ec7-4690-a089-dee182d7356b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_eaef3aa3-424f-4127-a3fc-64f2128e2491" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_b237d858-9ec7-4690-a089-dee182d7356b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonfinancialLiabilitiesFairValueDisclosure_87cb17ad-b377-4ee3-9d68-53d2c68f41f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonfinancialLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_b237d858-9ec7-4690-a089-dee182d7356b" xlink:to="loc_us-gaap_NonfinancialLiabilitiesFairValueDisclosure_87cb17ad-b377-4ee3-9d68-53d2c68f41f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a30dcbd7-f592-4490-bd09-da8cacd76055" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_eaef3aa3-424f-4127-a3fc-64f2128e2491" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a30dcbd7-f592-4490-bd09-da8cacd76055" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3baca8c0-1feb-4f61-8b9f-76c426b60bd2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a30dcbd7-f592-4490-bd09-da8cacd76055" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3baca8c0-1feb-4f61-8b9f-76c426b60bd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_3baca8c0-1feb-4f61-8b9f-76c426b60bd2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3baca8c0-1feb-4f61-8b9f-76c426b60bd2" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_3baca8c0-1feb-4f61-8b9f-76c426b60bd2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_3e438509-a253-4d6a-b6a6-50e14282cc71" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_3baca8c0-1feb-4f61-8b9f-76c426b60bd2" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_3e438509-a253-4d6a-b6a6-50e14282cc71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_27e6d909-834f-4734-9766-9db5e2d231f1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_3e438509-a253-4d6a-b6a6-50e14282cc71" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_27e6d909-834f-4734-9766-9db5e2d231f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c04ffb9e-ebe6-467e-9bf2-203b8f3f2e11" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a30dcbd7-f592-4490-bd09-da8cacd76055" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c04ffb9e-ebe6-467e-9bf2-203b8f3f2e11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c04ffb9e-ebe6-467e-9bf2-203b8f3f2e11_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c04ffb9e-ebe6-467e-9bf2-203b8f3f2e11" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c04ffb9e-ebe6-467e-9bf2-203b8f3f2e11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_afa0cd41-598e-4c2f-b339-53c00f457c63" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c04ffb9e-ebe6-467e-9bf2-203b8f3f2e11" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_afa0cd41-598e-4c2f-b339-53c00f457c63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_e7ec2c27-f258-4b52-8ea8-ecf25e5c6677" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_afa0cd41-598e-4c2f-b339-53c00f457c63" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_e7ec2c27-f258-4b52-8ea8-ecf25e5c6677" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_82bec656-3617-4843-ada1-a0876525babf" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_afa0cd41-598e-4c2f-b339-53c00f457c63" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_82bec656-3617-4843-ada1-a0876525babf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_0c0986a4-6079-47ca-b71a-5c19ed352098" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_afa0cd41-598e-4c2f-b339-53c00f457c63" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_0c0986a4-6079-47ca-b71a-5c19ed352098" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_00bb496c-3ed6-4dff-a60a-dc053e03a1d3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a30dcbd7-f592-4490-bd09-da8cacd76055" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_00bb496c-3ed6-4dff-a60a-dc053e03a1d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_00bb496c-3ed6-4dff-a60a-dc053e03a1d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_00bb496c-3ed6-4dff-a60a-dc053e03a1d3" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_00bb496c-3ed6-4dff-a60a-dc053e03a1d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_5000a8ec-39d4-440e-82e6-a1af11a5f5c4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_00bb496c-3ed6-4dff-a60a-dc053e03a1d3" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_5000a8ec-39d4-440e-82e6-a1af11a5f5c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_b65f927b-75b6-4bf3-92c3-dc1a2ce43040" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_5000a8ec-39d4-440e-82e6-a1af11a5f5c4" xlink:to="loc_us-gaap_MoneyMarketFundsMember_b65f927b-75b6-4bf3-92c3-dc1a2ce43040" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/FairValueofFinancialInstrumentsScheduleofReconciliationofContingentConsiderationMeasuredatFairValueDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#FairValueofFinancialInstrumentsScheduleofReconciliationofContingentConsiderationMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/FairValueofFinancialInstrumentsScheduleofReconciliationofContingentConsiderationMeasuredatFairValueDetails" xlink:type="extended" id="i5a24171614dc4c82ad6e7ac8abf40d01_FairValueofFinancialInstrumentsScheduleofReconciliationofContingentConsiderationMeasuredatFairValueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_e03634c8-0a71-4751-a0bd-92b2610bef0c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_bd6ba504-8dee-4f77-862d-d25f00bc6c50" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_e03634c8-0a71-4751-a0bd-92b2610bef0c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_bd6ba504-8dee-4f77-862d-d25f00bc6c50" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_c02d5ef5-fbf7-4247-86d1-11d851b28452" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_bd6ba504-8dee-4f77-862d-d25f00bc6c50" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_c02d5ef5-fbf7-4247-86d1-11d851b28452" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_61fadbdd-ddf7-428e-8ae8-25dc6de2a075" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_bd6ba504-8dee-4f77-862d-d25f00bc6c50" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_61fadbdd-ddf7-428e-8ae8-25dc6de2a075" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_c583e4f0-fb38-44d2-b63d-9922c92879fc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_bd6ba504-8dee-4f77-862d-d25f00bc6c50" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_c583e4f0-fb38-44d2-b63d-9922c92879fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_f110dd78-53e3-49d4-b021-c830d7f40feb" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_597c7472-2289-469f-adea-2de737df2dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_e03634c8-0a71-4751-a0bd-92b2610bef0c" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_597c7472-2289-469f-adea-2de737df2dd1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_729e7f6a-5670-47af-8520-b9ae4b56f7f8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_597c7472-2289-469f-adea-2de737df2dd1" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_729e7f6a-5670-47af-8520-b9ae4b56f7f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_729e7f6a-5670-47af-8520-b9ae4b56f7f8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_729e7f6a-5670-47af-8520-b9ae4b56f7f8" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_729e7f6a-5670-47af-8520-b9ae4b56f7f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_de61adfd-0ea8-471c-a1f9-ab7cc8580488" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_729e7f6a-5670-47af-8520-b9ae4b56f7f8" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_de61adfd-0ea8-471c-a1f9-ab7cc8580488" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_5c453957-12dc-455e-9fc2-1bf80e3b8f87" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_de61adfd-0ea8-471c-a1f9-ab7cc8580488" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_5c453957-12dc-455e-9fc2-1bf80e3b8f87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_bc179d25-cd23-4d30-8874-e222d700384f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_597c7472-2289-469f-adea-2de737df2dd1" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_bc179d25-cd23-4d30-8874-e222d700384f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_bc179d25-cd23-4d30-8874-e222d700384f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_bc179d25-cd23-4d30-8874-e222d700384f" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_bc179d25-cd23-4d30-8874-e222d700384f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e1b1d0a0-08af-4a3c-bc84-22694e63b72f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_bc179d25-cd23-4d30-8874-e222d700384f" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e1b1d0a0-08af-4a3c-bc84-22694e63b72f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_a5100200-d66d-4907-97f2-b0a945888d7e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_e1b1d0a0-08af-4a3c-bc84-22694e63b72f" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_a5100200-d66d-4907-97f2-b0a945888d7e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#FairValueofFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="extended" id="ia835391f41ff437caec8b2433110363a_FairValueofFinancialInstrumentsNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_cbc81d6f-18f1-41a3-9700-1f5c8a714b7a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_47defb1f-a3ab-4832-98ca-906631bbefb2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_cbc81d6f-18f1-41a3-9700-1f5c8a714b7a" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_47defb1f-a3ab-4832-98ca-906631bbefb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_18a51b50-3ce0-49f8-b1aa-11e20be5d958" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_cbc81d6f-18f1-41a3-9700-1f5c8a714b7a" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_18a51b50-3ce0-49f8-b1aa-11e20be5d958" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80571aca-28fc-482f-9a91-7bd9fd54f72b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_18a51b50-3ce0-49f8-b1aa-11e20be5d958" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80571aca-28fc-482f-9a91-7bd9fd54f72b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_80571aca-28fc-482f-9a91-7bd9fd54f72b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80571aca-28fc-482f-9a91-7bd9fd54f72b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_80571aca-28fc-482f-9a91-7bd9fd54f72b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_973465bd-16e4-4456-9b3e-1343026dc608" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_80571aca-28fc-482f-9a91-7bd9fd54f72b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_973465bd-16e4-4456-9b3e-1343026dc608" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_16d5e27e-6b95-4831-b7b1-964062a1cab8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_973465bd-16e4-4456-9b3e-1343026dc608" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_16d5e27e-6b95-4831-b7b1-964062a1cab8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/IncomeTaxesComponentsDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#IncomeTaxesComponentsDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/IncomeTaxesComponentsDetails" xlink:type="extended" id="i65cd3b64d1224e4baabcec8c01816469_IncomeTaxesComponentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_43dc0e0e-7735-41e6-b07b-0c6f78e04a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_0a3a1ca2-aba9-4ab0-8720-878bf88ab70a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_43dc0e0e-7735-41e6-b07b-0c6f78e04a3a" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_0a3a1ca2-aba9-4ab0-8720-878bf88ab70a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_cae1738f-6275-48ba-ac63-c9198a953aa7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_0a3a1ca2-aba9-4ab0-8720-878bf88ab70a" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_cae1738f-6275-48ba-ac63-c9198a953aa7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentForeignTaxExpenseBenefit_891a8c68-44e6-4253-abfb-dfa70298a9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentForeignTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_0a3a1ca2-aba9-4ab0-8720-878bf88ab70a" xlink:to="loc_us-gaap_CurrentForeignTaxExpenseBenefit_891a8c68-44e6-4253-abfb-dfa70298a9b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_eddb0ad1-acab-4a8b-b35f-5b04ad3a72d7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_0a3a1ca2-aba9-4ab0-8720-878bf88ab70a" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_eddb0ad1-acab-4a8b-b35f-5b04ad3a72d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_21fcff46-f03f-4966-a4ca-b5646b766f97" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_43dc0e0e-7735-41e6-b07b-0c6f78e04a3a" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_21fcff46-f03f-4966-a4ca-b5646b766f97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_502f526b-1315-472c-b417-45abf00a2f05" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredFederalIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_21fcff46-f03f-4966-a4ca-b5646b766f97" xlink:to="loc_us-gaap_DeferredFederalIncomeTaxExpenseBenefit_502f526b-1315-472c-b417-45abf00a2f05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_27736a4f-7ae7-41bf-ab4c-a991fe07a82c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_21fcff46-f03f-4966-a4ca-b5646b766f97" xlink:to="loc_us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit_27736a4f-7ae7-41bf-ab4c-a991fe07a82c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_568fdbd8-f400-4a9d-b72a-7e60152174ab" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredForeignIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_21fcff46-f03f-4966-a4ca-b5646b766f97" xlink:to="loc_us-gaap_DeferredForeignIncomeTaxExpenseBenefit_568fdbd8-f400-4a9d-b72a-7e60152174ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_674b4618-9662-421a-8cc4-b2e89a409370" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_21fcff46-f03f-4966-a4ca-b5646b766f97" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_674b4618-9662-421a-8cc4-b2e89a409370" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_c9b35c76-c95f-47c5-aecd-877aba5bd32a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_21fcff46-f03f-4966-a4ca-b5646b766f97" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_c9b35c76-c95f-47c5-aecd-877aba5bd32a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_173df523-c60f-4e03-a254-2a062d9ab9fe" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_43dc0e0e-7735-41e6-b07b-0c6f78e04a3a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_173df523-c60f-4e03-a254-2a062d9ab9fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_b98499eb-3018-4ccf-93f5-05d42c29c9a7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_43dc0e0e-7735-41e6-b07b-0c6f78e04a3a" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_b98499eb-3018-4ccf-93f5-05d42c29c9a7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_333c4204-acbd-4c17-a8db-fd21a303ce8f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_b98499eb-3018-4ccf-93f5-05d42c29c9a7" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_333c4204-acbd-4c17-a8db-fd21a303ce8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_333c4204-acbd-4c17-a8db-fd21a303ce8f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_333c4204-acbd-4c17-a8db-fd21a303ce8f" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_333c4204-acbd-4c17-a8db-fd21a303ce8f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_a81bb199-c2fd-4414-b0cf-e347a3cbbb1c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_333c4204-acbd-4c17-a8db-fd21a303ce8f" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_a81bb199-c2fd-4414-b0cf-e347a3cbbb1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_5c5768fa-c352-4dac-a4bc-58db575417f9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_a81bb199-c2fd-4414-b0cf-e347a3cbbb1c" xlink:to="loc_us-gaap_DomesticCountryMember_5c5768fa-c352-4dac-a4bc-58db575417f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_d7bb7a05-f364-4e62-b0e8-1c276df73d79" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_a81bb199-c2fd-4414-b0cf-e347a3cbbb1c" xlink:to="loc_us-gaap_ForeignCountryMember_d7bb7a05-f364-4e62-b0e8-1c276df73d79" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/IncomeTaxesOperatingLossesandTaxCreditsDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#IncomeTaxesOperatingLossesandTaxCreditsDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/IncomeTaxesOperatingLossesandTaxCreditsDetails" xlink:type="extended" id="i379dd7dbb7d9408bb2ecd1c43e98da86_IncomeTaxesOperatingLossesandTaxCreditsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_6b4880c9-de48-4c57-8132-1095863e5530" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_0c6aaec0-ec65-4aa6-b921-b12f25f0c506" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_6b4880c9-de48-4c57-8132-1095863e5530" xlink:to="loc_us-gaap_OperatingLossCarryforwards_0c6aaec0-ec65-4aa6-b921-b12f25f0c506" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_323651e7-8775-4121-9cbd-6aa834fb554b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_6b4880c9-de48-4c57-8132-1095863e5530" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_323651e7-8775-4121-9cbd-6aa834fb554b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_123a3101-3e07-47d6-8a1e-1572b64050e2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_6b4880c9-de48-4c57-8132-1095863e5530" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_123a3101-3e07-47d6-8a1e-1572b64050e2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_d2a9d2fa-c721-4456-9246-f8df61826a4e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_123a3101-3e07-47d6-8a1e-1572b64050e2" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_d2a9d2fa-c721-4456-9246-f8df61826a4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_d2a9d2fa-c721-4456-9246-f8df61826a4e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_d2a9d2fa-c721-4456-9246-f8df61826a4e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_d2a9d2fa-c721-4456-9246-f8df61826a4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_1ca0e550-e6ca-4651-a6e8-35c30eb4ec76" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_d2a9d2fa-c721-4456-9246-f8df61826a4e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_1ca0e550-e6ca-4651-a6e8-35c30eb4ec76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_f3fa6386-295d-4997-b730-13ba86d5d7a9" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_1ca0e550-e6ca-4651-a6e8-35c30eb4ec76" xlink:to="loc_us-gaap_DomesticCountryMember_f3fa6386-295d-4997-b730-13ba86d5d7a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_68771203-3345-43fe-abce-94674b6236e6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_1ca0e550-e6ca-4651-a6e8-35c30eb4ec76" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_68771203-3345-43fe-abce-94674b6236e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_a49fea0f-4704-405c-8bca-bab1f474940e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_1ca0e550-e6ca-4651-a6e8-35c30eb4ec76" xlink:to="loc_us-gaap_ForeignCountryMember_a49fea0f-4704-405c-8bca-bab1f474940e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodAxis_b4fd9574-5ebb-44f1-9023-819b0a1b61a6" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_123a3101-3e07-47d6-8a1e-1572b64050e2" xlink:to="loc_us-gaap_TaxPeriodAxis_b4fd9574-5ebb-44f1-9023-819b0a1b61a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_b4fd9574-5ebb-44f1-9023-819b0a1b61a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxPeriodAxis_b4fd9574-5ebb-44f1-9023-819b0a1b61a6" xlink:to="loc_us-gaap_TaxPeriodDomain_b4fd9574-5ebb-44f1-9023-819b0a1b61a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_6a0c7f56-c438-4e2d-afc4-f754f5e69552" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxPeriodAxis_b4fd9574-5ebb-44f1-9023-819b0a1b61a6" xlink:to="loc_us-gaap_TaxPeriodDomain_6a0c7f56-c438-4e2d-afc4-f754f5e69552" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_AfterTaxYear2017Member_6c6ceace-2247-47d3-92c0-60babbdfb35c" xlink:href="evcm-20211231.xsd#evcm_AfterTaxYear2017Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_6a0c7f56-c438-4e2d-afc4-f754f5e69552" xlink:to="loc_evcm_AfterTaxYear2017Member_6c6ceace-2247-47d3-92c0-60babbdfb35c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_BeforeTaxYear2018Member_44786271-f805-4c50-8c9a-7f5ff0662c29" xlink:href="evcm-20211231.xsd#evcm_BeforeTaxYear2018Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_6a0c7f56-c438-4e2d-afc4-f754f5e69552" xlink:to="loc_evcm_BeforeTaxYear2018Member_44786271-f805-4c50-8c9a-7f5ff0662c29" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/IncomeTaxesIncomeTaxRateReconciliationDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#IncomeTaxesIncomeTaxRateReconciliationDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/IncomeTaxesIncomeTaxRateReconciliationDetails" xlink:type="extended" id="i6bb08e07062f441fb4f61e938aaec2d2_IncomeTaxesIncomeTaxRateReconciliationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_6c1f3fb2-5e07-4286-b674-c856c6f78b84" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_71c7759b-ac69-4121-87ad-9b2ebbbf9e4c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_6c1f3fb2-5e07-4286-b674-c856c6f78b84" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_71c7759b-ac69-4121-87ad-9b2ebbbf9e4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_6c1f3fb2-5e07-4286-b674-c856c6f78b84" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_8b48f6ef-35ba-4b7f-858f-a8d4bcb7694a" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_8b48f6ef-35ba-4b7f-858f-a8d4bcb7694a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_85509ffc-c8d8-451a-a281-d4f6aeb1bf3b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitAmount_85509ffc-c8d8-451a-a281-d4f6aeb1bf3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_853fc497-4a81-467d-9d3c-3d821cd96ad8" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_853fc497-4a81-467d-9d3c-3d821cd96ad8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpense_bb3ee192-87a8-4420-b1e8-dbf9763a4c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpense_bb3ee192-87a8-4420-b1e8-dbf9763a4c1d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_dc5fac93-7b66-47fe-af6f-b62936c8f6e7" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate_dc5fac93-7b66-47fe-af6f-b62936c8f6e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_655342df-7fc4-4338-8db8-1655c01d0803" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_655342df-7fc4-4338-8db8-1655c01d0803" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_1ea77c57-085f-48dd-807f-7f976804870e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_1ea77c57-085f-48dd-807f-7f976804870e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxCredits_245b1ccc-c032-40f5-bc98-eaad6953addc" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxCredits_245b1ccc-c032-40f5-bc98-eaad6953addc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_96d7c7f5-7c36-4abf-abb4-ae4d328187d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_96d7c7f5-7c36-4abf-abb4-ae4d328187d4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_27e941ad-d244-48e8-88ce-da9bf3f0d66c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_3c18ea2a-0dec-45f4-9e25-4a87a34488a3" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_27e941ad-d244-48e8-88ce-da9bf3f0d66c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_fb6c6821-45ef-4379-9fe7-34340460572e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_6c1f3fb2-5e07-4286-b674-c856c6f78b84" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_fb6c6821-45ef-4379-9fe7-34340460572e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_6c1f3fb2-5e07-4286-b674-c856c6f78b84" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_9b5fd14b-83f4-4e01-967f-3ea77fe57f6d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_9b5fd14b-83f4-4e01-967f-3ea77fe57f6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_42eee13a-eda2-41d3-9ffd-686b177fd636" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent_42eee13a-eda2-41d3-9ffd-686b177fd636" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_f9716145-b01b-4879-b4a5-8b5a1ec3994e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_f9716145-b01b-4879-b4a5-8b5a1ec3994e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_e50c5eac-cece-4e93-ac3c-4bcb853da6c3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_e50c5eac-cece-4e93-ac3c-4bcb853da6c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_c0259c27-7acd-4bf6-9391-245d45c7263b" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate_c0259c27-7acd-4bf6-9391-245d45c7263b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_21d737a0-9f49-4159-a10e-a2b39f4ce8d4" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_21d737a0-9f49-4159-a10e-a2b39f4ce8d4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_4c179658-5e50-431e-8cd3-4467f90f7800" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_4c179658-5e50-431e-8cd3-4467f90f7800" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_b64689f0-ad5f-4f5f-9974-60a57c24c957" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits_b64689f0-ad5f-4f5f-9974-60a57c24c957" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_8128c427-a450-47c8-825b-53848c8b0fa2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_8128c427-a450-47c8-825b-53848c8b0fa2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_9adcbb2c-6d6e-4261-a195-041b8d381a67" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_7af2e5a7-ccd6-4280-88b9-d403c9046223" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_9adcbb2c-6d6e-4261-a195-041b8d381a67" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_e0577526-f4f1-4223-b33c-86fa9d2ae8b2" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_6c1f3fb2-5e07-4286-b674-c856c6f78b84" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_e0577526-f4f1-4223-b33c-86fa9d2ae8b2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_d55a9802-94a4-49b1-9bdd-7df4456312b3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_e0577526-f4f1-4223-b33c-86fa9d2ae8b2" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_d55a9802-94a4-49b1-9bdd-7df4456312b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_d55a9802-94a4-49b1-9bdd-7df4456312b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_d55a9802-94a4-49b1-9bdd-7df4456312b3" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_d55a9802-94a4-49b1-9bdd-7df4456312b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_8211964f-a6dc-474d-bfde-96cafdb45fb3" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_d55a9802-94a4-49b1-9bdd-7df4456312b3" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_8211964f-a6dc-474d-bfde-96cafdb45fb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_f77f9452-ece3-41f4-9306-ba89e565a362" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_8211964f-a6dc-474d-bfde-96cafdb45fb3" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_f77f9452-ece3-41f4-9306-ba89e565a362" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_43a1c8ca-91b7-48d9-8d10-8f22c8934b47" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_8211964f-a6dc-474d-bfde-96cafdb45fb3" xlink:to="loc_us-gaap_ForeignCountryMember_43a1c8ca-91b7-48d9-8d10-8f22c8934b47" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/RelatedPartiesDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#RelatedPartiesDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/RelatedPartiesDetails" xlink:type="extended" id="iee6db4adb06941f1883ee5062c0923e2_RelatedPartiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_9f01971b-7132-41f3-9109-ad99c9472c53" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_NumberOfDebtInstruments_2b887c46-fa40-459e-bcb9-4ee11eeaf1b7" xlink:href="evcm-20211231.xsd#evcm_NumberOfDebtInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9f01971b-7132-41f3-9109-ad99c9472c53" xlink:to="loc_evcm_NumberOfDebtInstruments_2b887c46-fa40-459e-bcb9-4ee11eeaf1b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RelatedPartyTransactionNumberOfFormerOwnersOfAcquiredBusinessesGivenPromissoryNotes_127b2419-38fe-4c84-9eb8-b1527600302d" xlink:href="evcm-20211231.xsd#evcm_RelatedPartyTransactionNumberOfFormerOwnersOfAcquiredBusinessesGivenPromissoryNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9f01971b-7132-41f3-9109-ad99c9472c53" xlink:to="loc_evcm_RelatedPartyTransactionNumberOfFormerOwnersOfAcquiredBusinessesGivenPromissoryNotes_127b2419-38fe-4c84-9eb8-b1527600302d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_RelatedPartyTransactionNumberOfFormerOwnersOfAcquiredBusinessesThatAreNoLongerAnEmployee_4e490037-4f8f-49e4-89d1-aaeb3b839601" xlink:href="evcm-20211231.xsd#evcm_RelatedPartyTransactionNumberOfFormerOwnersOfAcquiredBusinessesThatAreNoLongerAnEmployee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9f01971b-7132-41f3-9109-ad99c9472c53" xlink:to="loc_evcm_RelatedPartyTransactionNumberOfFormerOwnersOfAcquiredBusinessesThatAreNoLongerAnEmployee_4e490037-4f8f-49e4-89d1-aaeb3b839601" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_59aefd4c-e97c-4937-8f29-62edf45c7b00" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_9f01971b-7132-41f3-9109-ad99c9472c53" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_59aefd4c-e97c-4937-8f29-62edf45c7b00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1efc783a-40e9-4b79-afea-40a542ddd7bd" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_59aefd4c-e97c-4937-8f29-62edf45c7b00" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1efc783a-40e9-4b79-afea-40a542ddd7bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_1efc783a-40e9-4b79-afea-40a542ddd7bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1efc783a-40e9-4b79-afea-40a542ddd7bd" xlink:to="loc_us-gaap_RelatedPartyDomain_1efc783a-40e9-4b79-afea-40a542ddd7bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_59132092-e15f-4bd6-9693-f9b08eb4959d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1efc783a-40e9-4b79-afea-40a542ddd7bd" xlink:to="loc_us-gaap_RelatedPartyDomain_59132092-e15f-4bd6-9693-f9b08eb4959d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_EmployeeMember_f66dcc11-4d03-4ae4-8b29-02056cfa73ad" xlink:href="evcm-20211231.xsd#evcm_EmployeeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_59132092-e15f-4bd6-9693-f9b08eb4959d" xlink:to="loc_evcm_EmployeeMember_f66dcc11-4d03-4ae4-8b29-02056cfa73ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_evcm_FormerOwnerMember_7f5f6c0c-5896-47c8-9712-1eb9c4793bb4" xlink:href="evcm-20211231.xsd#evcm_FormerOwnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_59132092-e15f-4bd6-9693-f9b08eb4959d" xlink:to="loc_evcm_FormerOwnerMember_7f5f6c0c-5896-47c8-9712-1eb9c4793bb4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/GeographicAreasDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#GeographicAreasDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/GeographicAreasDetails" xlink:type="extended" id="i2638342b04e142f2aa7ddb40a4e4ec53_GeographicAreasDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b7d5253a-23a4-491d-8079-d83f7aaa687e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_d450ef26-2274-4661-a4d5-300124d0da45" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b7d5253a-23a4-491d-8079-d83f7aaa687e" xlink:to="loc_us-gaap_NoncurrentAssets_d450ef26-2274-4661-a4d5-300124d0da45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_691ef1cc-bffe-4541-95fb-844aab268828" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b7d5253a-23a4-491d-8079-d83f7aaa687e" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_691ef1cc-bffe-4541-95fb-844aab268828" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_66633092-d136-42af-bf8a-c84b7e633297" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_691ef1cc-bffe-4541-95fb-844aab268828" xlink:to="loc_srt_StatementGeographicalAxis_66633092-d136-42af-bf8a-c84b7e633297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_66633092-d136-42af-bf8a-c84b7e633297_default" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_66633092-d136-42af-bf8a-c84b7e633297" xlink:to="loc_srt_SegmentGeographicalDomain_66633092-d136-42af-bf8a-c84b7e633297_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_a41bf367-bbaa-4389-b810-b65762a75331" xlink:href="https://xbrl.fasb.org/srt/2021/elts/srt-2021-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_66633092-d136-42af-bf8a-c84b7e633297" xlink:to="loc_srt_SegmentGeographicalDomain_a41bf367-bbaa-4389-b810-b65762a75331" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_79f6092f-b9b0-447c-9c11-03db06d3d3a2" xlink:href="https://xbrl.sec.gov/country/2021/country-2021.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_a41bf367-bbaa-4389-b810-b65762a75331" xlink:to="loc_country_US_79f6092f-b9b0-447c-9c11-03db06d3d3a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_3c3c597a-e0e0-419e-af9c-736ac0e0f8af" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_a41bf367-bbaa-4389-b810-b65762a75331" xlink:to="loc_us-gaap_NonUsMember_3c3c597a-e0e0-419e-af9c-736ac0e0f8af" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.evercommerce.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="evcm-20211231.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.evercommerce.com/role/SubsequentEventsDetails" xlink:type="extended" id="i202903e38bc048c89a9870a1065d863f_SubsequentEventsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_f86d05d9-d9a6-49a0-8df2-f2590a5e9940" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_544ab267-816b-476e-a61c-aa65fac63c66" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_f86d05d9-d9a6-49a0-8df2-f2590a5e9940" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_544ab267-816b-476e-a61c-aa65fac63c66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_3a66c83d-7a4d-4f24-9dc0-f9fec1d34662" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_f86d05d9-d9a6-49a0-8df2-f2590a5e9940" xlink:to="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_3a66c83d-7a4d-4f24-9dc0-f9fec1d34662" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_3a724284-d055-4f50-b682-1a917552b97d" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_f86d05d9-d9a6-49a0-8df2-f2590a5e9940" xlink:to="loc_us-gaap_SubsequentEventTable_3a724284-d055-4f50-b682-1a917552b97d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_0a214f51-f80f-4e2b-ba83-20904acfa44c" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_3a724284-d055-4f50-b682-1a917552b97d" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_0a214f51-f80f-4e2b-ba83-20904acfa44c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_0a214f51-f80f-4e2b-ba83-20904acfa44c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0a214f51-f80f-4e2b-ba83-20904acfa44c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_0a214f51-f80f-4e2b-ba83-20904acfa44c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_b9b797ed-535c-4b09-be7f-43da2ec3372f" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_0a214f51-f80f-4e2b-ba83-20904acfa44c" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_b9b797ed-535c-4b09-be7f-43da2ec3372f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_fda72dc0-415a-48e7-b4c5-73bb4f0adf50" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_b9b797ed-535c-4b09-be7f-43da2ec3372f" xlink:to="loc_us-gaap_SubsequentEventMember_fda72dc0-415a-48e7-b4c5-73bb4f0adf50" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
