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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2022 Workiva-->
<!--r:a2da3af4-2cf7-4d25-8571-01470ed9d9d3,g:66c925be-2fa9-4938-a803-4dcba345c8ca-->
<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.blackbaud.com/role/Document" xlink:type="simple" xlink:href="blkb-20220930.xsd#Document"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/Document" xlink:type="extended" id="i160f90f2ce2c464f9b237ade39f4d42c_Document">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_9f4033ff-a351-47d7-8a6c-11155e78b1f2" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_DocumentType_9f4033ff-a351-47d7-8a6c-11155e78b1f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_2c0e9683-c4c0-4d8d-8f35-fd0bc9cd3773" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_DocumentQuarterlyReport_2c0e9683-c4c0-4d8d-8f35-fd0bc9cd3773" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_3f667333-e48f-488c-8708-752bdbcaa6d0" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_DocumentPeriodEndDate_3f667333-e48f-488c-8708-752bdbcaa6d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_c2bd9e39-b77b-4e18-8b2a-f45fbc15f06d" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_DocumentTransitionReport_c2bd9e39-b77b-4e18-8b2a-f45fbc15f06d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_a5877196-723f-44f1-b766-a2bea7d6a410" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityFileNumber_a5877196-723f-44f1-b766-a2bea7d6a410" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_3b55facc-44a5-444f-90be-7a911e7642f0" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityRegistrantName_3b55facc-44a5-444f-90be-7a911e7642f0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_ea539513-53c0-4da5-b740-398fac2ff26a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityIncorporationStateCountryCode_ea539513-53c0-4da5-b740-398fac2ff26a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_a069043e-359d-4be3-9c56-573ec41425fe" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityTaxIdentificationNumber_a069043e-359d-4be3-9c56-573ec41425fe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_1c3b095b-4880-4f9c-bb3d-8f1398569ad9" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityAddressAddressLine1_1c3b095b-4880-4f9c-bb3d-8f1398569ad9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_d4551f71-5c96-45c9-bc4f-ccf187986b8c" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityAddressCityOrTown_d4551f71-5c96-45c9-bc4f-ccf187986b8c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_d3ff2254-1218-433c-b4d7-6202a743d04b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityAddressStateOrProvince_d3ff2254-1218-433c-b4d7-6202a743d04b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_7e4569cb-5d33-4ae2-ab18-5d2f940258e6" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityAddressPostalZipCode_7e4569cb-5d33-4ae2-ab18-5d2f940258e6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_e0cec778-5438-4a9a-9ec5-cc945cda9856" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_CityAreaCode_e0cec778-5438-4a9a-9ec5-cc945cda9856" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_e921afd7-686e-4db5-a8ab-41f7a8f69f8c" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_LocalPhoneNumber_e921afd7-686e-4db5-a8ab-41f7a8f69f8c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_2a8151ac-ce3f-40a1-9aaa-3704f18412db" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_Security12bTitle_2a8151ac-ce3f-40a1-9aaa-3704f18412db" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_1c71972b-342b-426b-9a60-7df78d55fc37" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_TradingSymbol_1c71972b-342b-426b-9a60-7df78d55fc37" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_NoTradingSymbolFlag_5aaf576d-0de8-49e6-9896-8e460148ba51" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_NoTradingSymbolFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_NoTradingSymbolFlag_5aaf576d-0de8-49e6-9896-8e460148ba51" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_9959a09e-8b53-4177-a91a-5dea3a83a2c3" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_SecurityExchangeName_9959a09e-8b53-4177-a91a-5dea3a83a2c3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_f5f4d63c-a4fb-40dc-bdad-178b5fe6d5ba" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityCurrentReportingStatus_f5f4d63c-a4fb-40dc-bdad-178b5fe6d5ba" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_3bbf4489-30d1-4a76-856b-3150daa7470b" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityInteractiveDataCurrent_3bbf4489-30d1-4a76-856b-3150daa7470b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_87b9ea8a-0133-4f11-9f51-74e70846f23d" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityFilerCategory_87b9ea8a-0133-4f11-9f51-74e70846f23d" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_081ef4a3-0c6f-40ed-9df9-4ea77f7168fe" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntitySmallBusiness_081ef4a3-0c6f-40ed-9df9-4ea77f7168fe" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_9377e8c5-d879-43e9-97d9-a94c59427fb6" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityEmergingGrowthCompany_9377e8c5-d879-43e9-97d9-a94c59427fb6" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_7d801b0a-d133-46a6-b65d-998d21ae67ea" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityShellCompany_7d801b0a-d133-46a6-b65d-998d21ae67ea" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_30ed02ff-3cf1-4c05-a720-848e20931851" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_30ed02ff-3cf1-4c05-a720-848e20931851" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_b4b98785-8a6f-47ce-b413-69c048696789" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_AmendmentFlag_b4b98785-8a6f-47ce-b413-69c048696789" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_78aa89df-4d8c-4ef8-b81f-8151604ddd1a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_DocumentFiscalYearFocus_78aa89df-4d8c-4ef8-b81f-8151604ddd1a" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_39b7dc27-d78f-4db1-a2a2-0c99cdd6d6f6" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_DocumentFiscalPeriodFocus_39b7dc27-d78f-4db1-a2a2-0c99cdd6d6f6" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_96abb58b-6bc6-4493-a1aa-f05af5f02a02" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_EntityCentralIndexKey_96abb58b-6bc6-4493-a1aa-f05af5f02a02" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_c9032850-5187-4c94-808c-5be5a3dc4604" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_CurrentFiscalYearEndDate_c9032850-5187-4c94-808c-5be5a3dc4604" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_d62a968b-0121-4b1d-85c4-0a64adf71c28" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_42ef873e-a5cc-4421-8947-577db8972705" xlink:to="loc_dei_DocumentInformationTable_d62a968b-0121-4b1d-85c4-0a64adf71c28" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_868c9a14-423c-4303-9078-76437d39424a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_d62a968b-0121-4b1d-85c4-0a64adf71c28" xlink:to="loc_us-gaap_StatementClassOfStockAxis_868c9a14-423c-4303-9078-76437d39424a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_868c9a14-423c-4303-9078-76437d39424a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_868c9a14-423c-4303-9078-76437d39424a" xlink:to="loc_us-gaap_ClassOfStockDomain_868c9a14-423c-4303-9078-76437d39424a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_33a26011-7b83-4960-bf42-b0fe790d9d67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_868c9a14-423c-4303-9078-76437d39424a" xlink:to="loc_us-gaap_ClassOfStockDomain_33a26011-7b83-4960-bf42-b0fe790d9d67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_8bf9539b-a0a7-45b8-b70d-154972ffb857" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_33a26011-7b83-4960-bf42-b0fe790d9d67" xlink:to="loc_us-gaap_CommonStockMember_8bf9539b-a0a7-45b8-b70d-154972ffb857" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_PreferredStockPurchaseRightsMember_7c316d3e-fdf6-4c8f-bd86-2bea1627b7d1" xlink:href="blkb-20220930.xsd#blkb_PreferredStockPurchaseRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_33a26011-7b83-4960-bf42-b0fe790d9d67" xlink:to="loc_blkb_PreferredStockPurchaseRightsMember_7c316d3e-fdf6-4c8f-bd86-2bea1627b7d1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="simple" xlink:href="blkb-20220930.xsd#CondensedConsolidatedStatementsofComprehensiveIncome"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofComprehensiveIncome" xlink:type="extended" id="ic1d7207e1b1249608e5ac15bc242fe67_CondensedConsolidatedStatementsofComprehensiveIncome">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_48a1bb2e-4345-4290-ad04-42fbb3a6891b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_RevenuesAbstract_48a1bb2e-4345-4290-ad04-42fbb3a6891b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8038820b-2471-4bdf-8a11-20fcb6361e50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_48a1bb2e-4345-4290-ad04-42fbb3a6891b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_8038820b-2471-4bdf-8a11-20fcb6361e50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_1c1e3219-5b27-4e5e-8c97-a9311accb16b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_CostOfRevenueAbstract_1c1e3219-5b27-4e5e-8c97-a9311accb16b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_c84fc9c3-fccb-44d8-a850-4d06e3ae899e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_1c1e3219-5b27-4e5e-8c97-a9311accb16b" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_c84fc9c3-fccb-44d8-a850-4d06e3ae899e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_807c536a-b6c9-47bf-ba6d-a34036082485" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_GrossProfit_807c536a-b6c9-47bf-ba6d-a34036082485" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_663ebe36-360e-41c7-becf-1202d6b04930" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:to="loc_us-gaap_SellingAndMarketingExpense_663ebe36-360e-41c7-becf-1202d6b04930" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_987c4cae-e8f9-499e-b73d-ae390df8cc1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_987c4cae-e8f9-499e-b73d-ae390df8cc1e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_7d48066c-b124-4f3a-813b-28941786d0ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_7d48066c-b124-4f3a-813b-28941786d0ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_c0abe926-0e6b-4174-8821-2a1cd9844f1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_c0abe926-0e6b-4174-8821-2a1cd9844f1e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_9b413888-85d0-4f32-9e65-79adb7580ffc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:to="loc_us-gaap_RestructuringCharges_9b413888-85d0-4f32-9e65-79adb7580ffc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_7772ae28-8914-42f6-98bd-7bdc1187b975" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_7559b17c-8170-466b-8d88-9a5ea9bdd9da" xlink:to="loc_us-gaap_OperatingExpenses_7772ae28-8914-42f6-98bd-7bdc1187b975" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_1ea337db-fd09-4dab-a945-5c9be92c0bae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_OperatingIncomeLoss_1ea337db-fd09-4dab-a945-5c9be92c0bae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_1856ca4f-b584-4910-9484-032cddf41ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_InterestExpense_1856ca4f-b584-4910-9484-032cddf41ce9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_NonoperatingIncomeExpenseExcludingInterestExpense_b2d23f67-aa08-4a9d-8c0a-6cb476f38d2a" xlink:href="blkb-20220930.xsd#blkb_NonoperatingIncomeExpenseExcludingInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_blkb_NonoperatingIncomeExpenseExcludingInterestExpense_b2d23f67-aa08-4a9d-8c0a-6cb476f38d2a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b57d081a-339c-4378-81bd-41e012d480d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_b57d081a-339c-4378-81bd-41e012d480d1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_0f738d9a-669c-40c5-86c4-9362fbfc74f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_0f738d9a-669c-40c5-86c4-9362fbfc74f6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_59ed976c-238a-4e92-8abe-40276a09bbb9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_NetIncomeLoss_59ed976c-238a-4e92-8abe-40276a09bbb9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_bdc8d6ca-df2b-4fa2-8c54-89b6d5abb256" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_EarningsPerShareAbstract_bdc8d6ca-df2b-4fa2-8c54-89b6d5abb256" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_367e9a54-daa3-455e-81fa-32bd48e661e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_bdc8d6ca-df2b-4fa2-8c54-89b6d5abb256" xlink:to="loc_us-gaap_EarningsPerShareBasic_367e9a54-daa3-455e-81fa-32bd48e661e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_e4a1a1ae-2bc1-4f75-aaa9-5babd4dbe4fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_bdc8d6ca-df2b-4fa2-8c54-89b6d5abb256" xlink:to="loc_us-gaap_EarningsPerShareDiluted_e4a1a1ae-2bc1-4f75-aaa9-5babd4dbe4fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_95f5d5e7-baf1-4153-b263-21bab1982a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_95f5d5e7-baf1-4153-b263-21bab1982a6e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_ca7dfb37-a135-45c6-ae10-38bcfaae99b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_95f5d5e7-baf1-4153-b263-21bab1982a6e" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_ca7dfb37-a135-45c6-ae10-38bcfaae99b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8d09ef93-945d-452e-828c-ac680cfb3f2c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_95f5d5e7-baf1-4153-b263-21bab1982a6e" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_8d09ef93-945d-452e-828c-ac680cfb3f2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5ad8cd91-0d95-46f1-b41a-b66332879793" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5ad8cd91-0d95-46f1-b41a-b66332879793" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_7d4ee42f-e0d8-4b9a-b76e-47c9cfd92b16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5ad8cd91-0d95-46f1-b41a-b66332879793" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_7d4ee42f-e0d8-4b9a-b76e-47c9cfd92b16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_cf9fa246-b568-4270-a947-663575a2e610" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5ad8cd91-0d95-46f1-b41a-b66332879793" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_cf9fa246-b568-4270-a947-663575a2e610" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_7499c4c2-372a-496a-9250-ce5ad091cc2e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_5ad8cd91-0d95-46f1-b41a-b66332879793" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_7499c4c2-372a-496a-9250-ce5ad091cc2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_e7b6ea23-b37d-43d2-817a-50814ca6f412" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_e7b6ea23-b37d-43d2-817a-50814ca6f412" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_aba0abf9-9924-4a90-a467-851a1e396a45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_38a46679-1c5e-4556-a749-d30e3e37b073" xlink:to="loc_us-gaap_StatementTable_aba0abf9-9924-4a90-a467-851a1e396a45" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_5b42e962-b98b-4ac3-afc8-4b5861385b45" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_aba0abf9-9924-4a90-a467-851a1e396a45" xlink:to="loc_srt_ProductOrServiceAxis_5b42e962-b98b-4ac3-afc8-4b5861385b45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_5b42e962-b98b-4ac3-afc8-4b5861385b45_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_5b42e962-b98b-4ac3-afc8-4b5861385b45" xlink:to="loc_srt_ProductsAndServicesDomain_5b42e962-b98b-4ac3-afc8-4b5861385b45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_21eeea2a-9541-46e0-a782-d4a631700124" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_5b42e962-b98b-4ac3-afc8-4b5861385b45" xlink:to="loc_srt_ProductsAndServicesDomain_21eeea2a-9541-46e0-a782-d4a631700124" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_RecurringMember_7385b87d-0407-435e-ae98-ff436ffd4c1a" xlink:href="blkb-20220930.xsd#blkb_RecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21eeea2a-9541-46e0-a782-d4a631700124" xlink:to="loc_blkb_RecurringMember_7385b87d-0407-435e-ae98-ff436ffd4c1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TechnologyServiceMember_e2cf97e1-0239-42cd-a9e6-5471f34fc771" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TechnologyServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_21eeea2a-9541-46e0-a782-d4a631700124" xlink:to="loc_us-gaap_TechnologyServiceMember_e2cf97e1-0239-42cd-a9e6-5471f34fc771" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofStockholdersEquity" xlink:type="simple" xlink:href="blkb-20220930.xsd#CondensedConsolidatedStatementsofStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/CondensedConsolidatedStatementsofStockholdersEquity" xlink:type="extended" id="iad35d0c128a04ead9586f5ea062fa4db_CondensedConsolidatedStatementsofStockholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_1710e357-06fe-44c0-b36b-04175840371d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_1710e357-06fe-44c0-b36b-04175840371d" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_b0ccc630-6193-4d37-b678-81a4504d8f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_SharesIssued_b0ccc630-6193-4d37-b678-81a4504d8f2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_6908cc96-59b5-4398-98b0-c3eeed33f192" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_StockholdersEquity_6908cc96-59b5-4398-98b0-c3eeed33f192" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_729f5d90-d096-4cc6-a5f7-52098b5c470b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_NetIncomeLoss_729f5d90-d096-4cc6-a5f7-52098b5c470b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_af6f6f6c-eee0-4def-80c0-9c8067154b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts_af6f6f6c-eee0-4def-80c0-9c8067154b8d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_RetirementsOfCommonStockShares_5ca64fbb-71ac-4976-825d-be3d0ca35317" xlink:href="blkb-20220930.xsd#blkb_RetirementsOfCommonStockShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_blkb_RetirementsOfCommonStockShares_5ca64fbb-71ac-4976-825d-be3d0ca35317" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_AdjustmentsToAdditionalPaidInCapitalStockIssuedRetirements_cf7a5104-d9e3-47fb-a3a4-7fc7a78ad008" xlink:href="blkb-20220930.xsd#blkb_AdjustmentsToAdditionalPaidInCapitalStockIssuedRetirements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_blkb_AdjustmentsToAdditionalPaidInCapitalStockIssuedRetirements_cf7a5104-d9e3-47fb-a3a4-7fc7a78ad008" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_ExerciseOfStockOptionsAndStockAppreciationRightsShares_1ca31627-9e55-4990-a954-a790459f956d" xlink:href="blkb-20220930.xsd#blkb_ExerciseOfStockOptionsAndStockAppreciationRightsShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_blkb_ExerciseOfStockOptionsAndStockAppreciationRightsShares_1ca31627-9e55-4990-a954-a790459f956d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_ExerciseOfStockOptionsAndStockAppreciationRightsValue_949609ab-679f-487c-bd94-6b104d9ecc31" xlink:href="blkb-20220930.xsd#blkb_ExerciseOfStockOptionsAndStockAppreciationRightsValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_blkb_ExerciseOfStockOptionsAndStockAppreciationRightsValue_949609ab-679f-487c-bd94-6b104d9ecc31" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights_af97445d-797e-4dcb-92ba-6f2997999ba4" xlink:href="blkb-20220930.xsd#blkb_SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_blkb_SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights_af97445d-797e-4dcb-92ba-6f2997999ba4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_ba16e839-2d6c-4680-a06a-254491a17f62" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_ba16e839-2d6c-4680-a06a-254491a17f62" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_a4418417-8bd1-4f19-8bb6-ccab8fc711ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_a4418417-8bd1-4f19-8bb6-ccab8fc711ba" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_1e5de75d-2583-4c60-b794-b9970bc2382a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_1e5de75d-2583-4c60-b794-b9970bc2382a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_b2a19ebf-e55a-49e5-bf12-f4dbdb9acd31" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross_b2a19ebf-e55a-49e5-bf12-f4dbdb9acd31" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_b9c1aa0c-c9f6-464d-a6e8-5d6b63d6c136" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited_b9c1aa0c-c9f6-464d-a6e8-5d6b63d6c136" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_07698bdc-e787-4d74-8b5c-d1e0764e46d8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_07698bdc-e787-4d74-8b5c-d1e0764e46d8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_dbf5bc43-d79d-480b-bc56-0acdfbb0e82d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_dbf5bc43-d79d-480b-bc56-0acdfbb0e82d" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_59bf4aa9-7cc8-4f04-9fb6-227685a13743" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_4ba8c22d-2a8b-4482-8e49-b265dceb33c8" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_59bf4aa9-7cc8-4f04-9fb6-227685a13743" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssued_c58ca999-e5d5-4bf1-8ad2-c970606facb5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesIssued"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c52dee89-ce32-48d7-85b7-dd625e571e80" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_81687f15-4bb3-4d9d-bf26-143c02e0f390" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_1710e357-06fe-44c0-b36b-04175840371d" xlink:to="loc_us-gaap_StatementTable_81687f15-4bb3-4d9d-bf26-143c02e0f390" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_cc98421b-da2a-4bac-afda-a65b731bec75" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_81687f15-4bb3-4d9d-bf26-143c02e0f390" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_cc98421b-da2a-4bac-afda-a65b731bec75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_cc98421b-da2a-4bac-afda-a65b731bec75_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_cc98421b-da2a-4bac-afda-a65b731bec75" xlink:to="loc_us-gaap_EquityComponentDomain_cc98421b-da2a-4bac-afda-a65b731bec75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_4f12d648-2179-4739-9f4c-6a705c681461" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_cc98421b-da2a-4bac-afda-a65b731bec75" xlink:to="loc_us-gaap_EquityComponentDomain_4f12d648-2179-4739-9f4c-6a705c681461" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_e75b8f3a-1209-4123-ab96-01b19aabdf11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4f12d648-2179-4739-9f4c-6a705c681461" xlink:to="loc_us-gaap_CommonStockMember_e75b8f3a-1209-4123-ab96-01b19aabdf11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_1d292278-fe20-4e62-b43d-a4da684f412e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4f12d648-2179-4739-9f4c-6a705c681461" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_1d292278-fe20-4e62-b43d-a4da684f412e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockMember_f6fc30a8-6a6a-403c-9b56-c62b39a9058d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TreasuryStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4f12d648-2179-4739-9f4c-6a705c681461" xlink:to="loc_us-gaap_TreasuryStockMember_f6fc30a8-6a6a-403c-9b56-c62b39a9058d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_702bde5e-043e-4b96-833a-1ed9e61f183c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4f12d648-2179-4739-9f4c-6a705c681461" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_702bde5e-043e-4b96-833a-1ed9e61f183c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_1bb4e706-4a8b-4edf-920c-1e2f33c363e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_4f12d648-2179-4739-9f4c-6a705c681461" xlink:to="loc_us-gaap_RetainedEarningsMember_1bb4e706-4a8b-4edf-920c-1e2f33c363e1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/BusinessCombinationsDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#BusinessCombinationsDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/BusinessCombinationsDetails" xlink:type="extended" id="ic2e39b6d019d4c109c69791ab27d4a59_BusinessCombinationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_6f31aa3a-8a7d-4d6a-a826-7cd03a51a6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_6f31aa3a-8a7d-4d6a-a826-7cd03a51a6d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_ef3c421b-76f4-4d2b-aae1-8ec40cab4906" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_ef3c421b-76f4-4d2b-aae1-8ec40cab4906" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_daf927ed-5eb8-40f4-9469-631a446aea1e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent_daf927ed-5eb8-40f4-9469-631a446aea1e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_0c8e183c-f882-4c7a-b0cd-515fcc0cac0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_0c8e183c-f882-4c7a-b0cd-515fcc0cac0e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_7b1a2e17-af4b-436f-ab1f-4611b0e2bca0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_7b1a2e17-af4b-436f-ab1f-4611b0e2bca0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_24293801-64e5-4024-a92c-c7361c0602c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_24293801-64e5-4024-a92c-c7361c0602c3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c0849007-4863-40d4-9a04-909afd9050f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_72cf202e-8820-4f9f-9a7a-eb9566501bee" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c0849007-4863-40d4-9a04-909afd9050f6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f4513e1e-cdd5-4b74-9220-8d01aea49c94" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c0849007-4863-40d4-9a04-909afd9050f6" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f4513e1e-cdd5-4b74-9220-8d01aea49c94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f4513e1e-cdd5-4b74-9220-8d01aea49c94_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f4513e1e-cdd5-4b74-9220-8d01aea49c94" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f4513e1e-cdd5-4b74-9220-8d01aea49c94_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_109d83b6-8578-46c9-9181-8b177a85ad1c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f4513e1e-cdd5-4b74-9220-8d01aea49c94" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_109d83b6-8578-46c9-9181-8b177a85ad1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_KilterMember_29f63631-a27f-4c71-9b6d-a502bc3a24dc" xlink:href="blkb-20220930.xsd#blkb_KilterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_109d83b6-8578-46c9-9181-8b177a85ad1c" xlink:to="loc_blkb_KilterMember_29f63631-a27f-4c71-9b6d-a502bc3a24dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_EVERFIMember_3e178a04-bf24-4da1-a6cb-4025dcad057e" xlink:href="blkb-20220930.xsd#blkb_EVERFIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_109d83b6-8578-46c9-9181-8b177a85ad1c" xlink:to="loc_blkb_EVERFIMember_3e178a04-bf24-4da1-a6cb-4025dcad057e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/GoodwillandOtherIntangibleAssetsChangeinGoodwillDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#GoodwillandOtherIntangibleAssetsChangeinGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/GoodwillandOtherIntangibleAssetsChangeinGoodwillDetails" xlink:type="extended" id="i2fc18e716c1544aba2aa2b13dcb6da55_GoodwillandOtherIntangibleAssetsChangeinGoodwillDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_81a413d1-d732-46f8-8db8-de50cb9b9b23" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_2670c059-511f-499c-af5d-df79c76d3cc5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_81a413d1-d732-46f8-8db8-de50cb9b9b23" xlink:to="loc_us-gaap_GoodwillRollForward_2670c059-511f-499c-af5d-df79c76d3cc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_bad3e2e4-9ad6-41bd-ac82-491f39c41b44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2670c059-511f-499c-af5d-df79c76d3cc5" xlink:to="loc_us-gaap_Goodwill_bad3e2e4-9ad6-41bd-ac82-491f39c41b44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_783f8e01-3d6a-472c-9fbc-db49cbf73ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2670c059-511f-499c-af5d-df79c76d3cc5" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_783f8e01-3d6a-472c-9fbc-db49cbf73ae5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_c7c4021b-7fa6-4fe0-bd2a-cbbc7c00f6af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2670c059-511f-499c-af5d-df79c76d3cc5" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_c7c4021b-7fa6-4fe0-bd2a-cbbc7c00f6af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_7c0153dd-e1e3-4226-9759-b9a313aa3adf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2670c059-511f-499c-af5d-df79c76d3cc5" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_7c0153dd-e1e3-4226-9759-b9a313aa3adf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_2983162e-445c-439f-93c0-3e4fd3922f67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_2670c059-511f-499c-af5d-df79c76d3cc5" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_2983162e-445c-439f-93c0-3e4fd3922f67" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_25a059f9-8e2b-4e5d-a43d-cc8197e0c3a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_53a91ce8-7aec-4e8d-8d87-7eef1f902732" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_81a413d1-d732-46f8-8db8-de50cb9b9b23" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_53a91ce8-7aec-4e8d-8d87-7eef1f902732" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_dcb67950-a2e6-41f3-bd3d-80c72e3ef6fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_53a91ce8-7aec-4e8d-8d87-7eef1f902732" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_dcb67950-a2e6-41f3-bd3d-80c72e3ef6fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dcb67950-a2e6-41f3-bd3d-80c72e3ef6fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dcb67950-a2e6-41f3-bd3d-80c72e3ef6fc" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_dcb67950-a2e6-41f3-bd3d-80c72e3ef6fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_41b166d4-dbb5-4959-a125-801875a2c23b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_dcb67950-a2e6-41f3-bd3d-80c72e3ef6fc" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_41b166d4-dbb5-4959-a125-801875a2c23b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_EVERFIMember_316b2b25-4f8e-4bcd-9ed6-50429a3ed2c3" xlink:href="blkb-20220930.xsd#blkb_EVERFIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_41b166d4-dbb5-4959-a125-801875a2c23b" xlink:to="loc_blkb_EVERFIMember_316b2b25-4f8e-4bcd-9ed6-50429a3ed2c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_KilterMember_6f66c38c-fe62-4030-9d18-84df100a9f08" xlink:href="blkb-20220930.xsd#blkb_KilterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_41b166d4-dbb5-4959-a125-801875a2c23b" xlink:to="loc_blkb_KilterMember_6f66c38c-fe62-4030-9d18-84df100a9f08" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails" xlink:type="extended" id="i9dcdd0140e794e249f0f23b4c3022816_FairValueMeasurementsAssetsandLiabilitiesMeasuredatFairValueonaRecurringBasisDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6085033e-583e-45d6-8417-3988dcc27bf1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_2e3595d6-090e-47b4-b133-37c056f8871c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6085033e-583e-45d6-8417-3988dcc27bf1" xlink:to="loc_us-gaap_DerivativeAssets_2e3595d6-090e-47b4-b133-37c056f8871c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_89f08bd1-cf96-4f56-aad4-352f7f7cc120" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6085033e-583e-45d6-8417-3988dcc27bf1" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_89f08bd1-cf96-4f56-aad4-352f7f7cc120" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_18b0f541-c1fc-4ca4-b0ad-29fb1132a850" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6085033e-583e-45d6-8417-3988dcc27bf1" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_18b0f541-c1fc-4ca4-b0ad-29fb1132a850" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_e9823bd5-7d6a-4f6e-bb49-7236db366cbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6085033e-583e-45d6-8417-3988dcc27bf1" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_e9823bd5-7d6a-4f6e-bb49-7236db366cbe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_2938d467-550c-40b8-8e7f-0af74654bdfc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6085033e-583e-45d6-8417-3988dcc27bf1" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_2938d467-550c-40b8-8e7f-0af74654bdfc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_34eaf12c-5e7c-4c49-ab5d-8fd0babf40de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_6085033e-583e-45d6-8417-3988dcc27bf1" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_34eaf12c-5e7c-4c49-ab5d-8fd0babf40de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f321e76-1b8d-4afc-a77c-23cf1237295c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_34eaf12c-5e7c-4c49-ab5d-8fd0babf40de" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f321e76-1b8d-4afc-a77c-23cf1237295c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_4f321e76-1b8d-4afc-a77c-23cf1237295c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f321e76-1b8d-4afc-a77c-23cf1237295c" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_4f321e76-1b8d-4afc-a77c-23cf1237295c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_609e12a9-ab9c-48a0-8814-d707cb783dca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_4f321e76-1b8d-4afc-a77c-23cf1237295c" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_609e12a9-ab9c-48a0-8814-d707cb783dca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_44eb23de-c58e-43f1-ada0-91aaf7622565" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_609e12a9-ab9c-48a0-8814-d707cb783dca" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_44eb23de-c58e-43f1-ada0-91aaf7622565" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6a34ef54-488f-45da-b8ed-d814ec97f4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_34eaf12c-5e7c-4c49-ab5d-8fd0babf40de" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6a34ef54-488f-45da-b8ed-d814ec97f4b9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6a34ef54-488f-45da-b8ed-d814ec97f4b9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6a34ef54-488f-45da-b8ed-d814ec97f4b9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_6a34ef54-488f-45da-b8ed-d814ec97f4b9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_541c58e7-4854-4373-b663-d6a83cbac0f2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_6a34ef54-488f-45da-b8ed-d814ec97f4b9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_541c58e7-4854-4373-b663-d6a83cbac0f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_07098e7a-1e17-4f5b-a0c0-6f528dc7f3fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_541c58e7-4854-4373-b663-d6a83cbac0f2" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_07098e7a-1e17-4f5b-a0c0-6f528dc7f3fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_48c98289-2705-4be7-9212-2e1ac168dc8b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_541c58e7-4854-4373-b663-d6a83cbac0f2" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_48c98289-2705-4be7-9212-2e1ac168dc8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_df828d80-54e3-418e-b778-ec11d86ce76a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_541c58e7-4854-4373-b663-d6a83cbac0f2" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_df828d80-54e3-418e-b778-ec11d86ce76a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/DebtDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#DebtDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/DebtDetails" xlink:type="extended" id="i41716544b7a14340877cb53dae25ad25_DebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_efba226b-810d-4b0a-a0c5-1c12add41b21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_efba226b-810d-4b0a-a0c5-1c12add41b21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_1eb65b83-90ef-4269-984b-f5fc1aa87ba3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_1eb65b83-90ef-4269-984b-f5fc1aa87ba3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_cdc5a0cf-632a-49a9-8dc7-d89ac5ab8584" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_cdc5a0cf-632a-49a9-8dc7-d89ac5ab8584" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_ba2dfcca-6fed-4bf0-bc0a-2af1f7819328" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_ba2dfcca-6fed-4bf0-bc0a-2af1f7819328" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_2e6b1671-a94d-4338-a833-41b2ddd612ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_2e6b1671-a94d-4338-a833-41b2ddd612ca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_be4af5e0-c031-4978-9711-cc3bf8394040" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_be4af5e0-c031-4978-9711-cc3bf8394040" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_NetLeverageRatio_be75c688-9945-4cec-9be6-622c69138084" xlink:href="blkb-20220930.xsd#blkb_NetLeverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_blkb_NetLeverageRatio_be75c688-9945-4cec-9be6-622c69138084" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_LineofCreditFacilityAvailableIncreaseCapacityAmount_caf9c740-0cac-457a-a32f-88ee7e8062ca" xlink:href="blkb-20220930.xsd#blkb_LineofCreditFacilityAvailableIncreaseCapacityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_blkb_LineofCreditFacilityAvailableIncreaseCapacityAmount_caf9c740-0cac-457a-a32f-88ee7e8062ca" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_adf376f4-e070-4cde-b464-78774fce3fa9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89cacd79-62a9-42d7-9bcd-4ee8f31b7e43" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_adf376f4-e070-4cde-b464-78774fce3fa9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_396a84cc-0285-4b62-a8e0-4be5e955521b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_adf376f4-e070-4cde-b464-78774fce3fa9" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_396a84cc-0285-4b62-a8e0-4be5e955521b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_396a84cc-0285-4b62-a8e0-4be5e955521b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_396a84cc-0285-4b62-a8e0-4be5e955521b" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_396a84cc-0285-4b62-a8e0-4be5e955521b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4cbba078-0308-4180-8340-5c71c0d7a9c4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis_396a84cc-0285-4b62-a8e0-4be5e955521b" xlink:to="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4cbba078-0308-4180-8340-5c71c0d7a9c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_GlobalHQMember_9c5f54ea-0b38-4e91-96cf-9e9d215dedf5" xlink:href="blkb-20220930.xsd#blkb_GlobalHQMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RealEstateAndAccumulatedDepreciationNameOfPropertyDomain_4cbba078-0308-4180-8340-5c71c0d7a9c4" xlink:to="loc_blkb_GlobalHQMember_9c5f54ea-0b38-4e91-96cf-9e9d215dedf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_f95ba334-535d-436e-9ed6-e09cad47dee2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_adf376f4-e070-4cde-b464-78774fce3fa9" xlink:to="loc_us-gaap_CreditFacilityAxis_f95ba334-535d-436e-9ed6-e09cad47dee2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_f95ba334-535d-436e-9ed6-e09cad47dee2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_f95ba334-535d-436e-9ed6-e09cad47dee2" xlink:to="loc_us-gaap_CreditFacilityDomain_f95ba334-535d-436e-9ed6-e09cad47dee2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_8fbcd8da-5a7e-4a18-9eca-f00b21e471dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_f95ba334-535d-436e-9ed6-e09cad47dee2" xlink:to="loc_us-gaap_CreditFacilityDomain_8fbcd8da-5a7e-4a18-9eca-f00b21e471dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_79aa8cc9-5f2c-462b-86f9-bd8c44e6b17c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_8fbcd8da-5a7e-4a18-9eca-f00b21e471dc" xlink:to="loc_us-gaap_SecuredDebtMember_79aa8cc9-5f2c-462b-86f9-bd8c44e6b17c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_NetLeverageRatioRequirementAxis_fa68e3e9-24d1-4078-886a-f8950ef86245" xlink:href="blkb-20220930.xsd#blkb_NetLeverageRatioRequirementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_adf376f4-e070-4cde-b464-78774fce3fa9" xlink:to="loc_blkb_NetLeverageRatioRequirementAxis_fa68e3e9-24d1-4078-886a-f8950ef86245" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_NetLeverageRatioRequirementDomain_fa68e3e9-24d1-4078-886a-f8950ef86245_default" xlink:href="blkb-20220930.xsd#blkb_NetLeverageRatioRequirementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_blkb_NetLeverageRatioRequirementAxis_fa68e3e9-24d1-4078-886a-f8950ef86245" xlink:to="loc_blkb_NetLeverageRatioRequirementDomain_fa68e3e9-24d1-4078-886a-f8950ef86245_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_NetLeverageRatioRequirementDomain_66cb36f9-d916-4310-b4ab-7a1ef17b705e" xlink:href="blkb-20220930.xsd#blkb_NetLeverageRatioRequirementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_blkb_NetLeverageRatioRequirementAxis_fa68e3e9-24d1-4078-886a-f8950ef86245" xlink:to="loc_blkb_NetLeverageRatioRequirementDomain_66cb36f9-d916-4310-b4ab-7a1ef17b705e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_MaximumThroughDecember312023Member_df9c11b9-303c-4a6a-a16a-086220471a84" xlink:href="blkb-20220930.xsd#blkb_MaximumThroughDecember312023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_NetLeverageRatioRequirementDomain_66cb36f9-d916-4310-b4ab-7a1ef17b705e" xlink:to="loc_blkb_MaximumThroughDecember312023Member_df9c11b9-303c-4a6a-a16a-086220471a84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_MaximumAfterDecember312023Member_2ed1f569-b023-4dc6-bbf9-a129b0f21cfe" xlink:href="blkb-20220930.xsd#blkb_MaximumAfterDecember312023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_NetLeverageRatioRequirementDomain_66cb36f9-d916-4310-b4ab-7a1ef17b705e" xlink:to="loc_blkb_MaximumAfterDecember312023Member_2ed1f569-b023-4dc6-bbf9-a129b0f21cfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7f44de54-8809-4b8c-9c06-2ec78ba7fad3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_adf376f4-e070-4cde-b464-78774fce3fa9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7f44de54-8809-4b8c-9c06-2ec78ba7fad3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7f44de54-8809-4b8c-9c06-2ec78ba7fad3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7f44de54-8809-4b8c-9c06-2ec78ba7fad3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7f44de54-8809-4b8c-9c06-2ec78ba7fad3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_94eae474-741e-4f51-93b6-eafb4617eb9d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7f44de54-8809-4b8c-9c06-2ec78ba7fad3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_94eae474-741e-4f51-93b6-eafb4617eb9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_EVERFIMember_59206adc-28af-4cf0-9f4a-1dbad7e83a15" xlink:href="blkb-20220930.xsd#blkb_EVERFIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_94eae474-741e-4f51-93b6-eafb4617eb9d" xlink:to="loc_blkb_EVERFIMember_59206adc-28af-4cf0-9f4a-1dbad7e83a15" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/DebtSummaryofDebtDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#DebtSummaryofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/DebtSummaryofDebtDetails" xlink:type="extended" id="i090cd82772254c06bea3304e84371086_DebtSummaryofDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_fe01e801-f509-4d04-8c0b-33b1b6319867" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_fe01e801-f509-4d04-8c0b-33b1b6319867" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_088b56c8-baa3-4276-9afa-4d1088255d16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:to="loc_us-gaap_OtherLongTermDebt_088b56c8-baa3-4276-9afa-4d1088255d16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_9ef139bf-209c-45c0-b7ad-2576680ff6ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_9ef139bf-209c-45c0-b7ad-2576680ff6ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_82a6b87a-b4f1-40cb-958e-8be0de3b1b2c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:to="loc_us-gaap_LongTermDebtCurrent_82a6b87a-b4f1-40cb-958e-8be0de3b1b2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_29ea58a0-ce61-4ac1-9621-0b2a736f9aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_29ea58a0-ce61-4ac1-9621-0b2a736f9aa8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_ea13b05f-1298-471a-ab06-b3e023b92ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_ea13b05f-1298-471a-ab06-b3e023b92ff4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_aaf4afbf-079e-4506-884c-352cd30f4901" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_54f69cd9-c139-4d59-b9ce-27045f7ee041" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_aaf4afbf-079e-4506-884c-352cd30f4901" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_0c284adf-0d5e-4099-8c8a-35fe7b381135" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_aaf4afbf-079e-4506-884c-352cd30f4901" xlink:to="loc_us-gaap_CreditFacilityAxis_0c284adf-0d5e-4099-8c8a-35fe7b381135" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_0c284adf-0d5e-4099-8c8a-35fe7b381135_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_0c284adf-0d5e-4099-8c8a-35fe7b381135" xlink:to="loc_us-gaap_CreditFacilityDomain_0c284adf-0d5e-4099-8c8a-35fe7b381135_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_0c284adf-0d5e-4099-8c8a-35fe7b381135" xlink:to="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_df4f0c91-d7cb-41c5-b7aa-1317c6c35421" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_df4f0c91-d7cb-41c5-b7aa-1317c6c35421" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_25d57e43-d0c7-4070-b243-8de3bac3f144" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:to="loc_us-gaap_SecuredDebtMember_25d57e43-d0c7-4070-b243-8de3bac3f144" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgagesMember_bc28ddba-c92e-46a4-9f18-c7435e6440c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:to="loc_us-gaap_MortgagesMember_bc28ddba-c92e-46a4-9f18-c7435e6440c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_a0d830e4-01b3-4f7e-92a3-b1a987e64ef7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:to="loc_us-gaap_LoansPayableMember_a0d830e4-01b3-4f7e-92a3-b1a987e64ef7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtMember_696e04f4-1b98-4989-9572-be262ca94d42" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:to="loc_us-gaap_ShortTermDebtMember_696e04f4-1b98-4989-9572-be262ca94d42" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMember_ffce3f75-7bd2-485b-987b-2508ad3d1f0d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bb9d8dba-f45e-4826-abb8-0b5381dae0b1" xlink:to="loc_us-gaap_LongTermDebtMember_ffce3f75-7bd2-485b-987b-2508ad3d1f0d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/DebtSummaryofOtherDebtDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#DebtSummaryofOtherDebtDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/DebtSummaryofOtherDebtDetails" xlink:type="extended" id="i181baec3d1a84e2eb9f11038f9691b9d_DebtSummaryofOtherDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_a64181ae-02e3-48fb-9cab-53c6931cb4ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_2cd53ee3-4680-4fd1-bfc4-ee22c0972a60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a64181ae-02e3-48fb-9cab-53c6931cb4ab" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_2cd53ee3-4680-4fd1-bfc4-ee22c0972a60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3394c052-5c52-49bf-8c54-0ed3d2c3c121" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_a64181ae-02e3-48fb-9cab-53c6931cb4ab" xlink:to="loc_us-gaap_DebtInstrumentTable_3394c052-5c52-49bf-8c54-0ed3d2c3c121" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_58425371-52f6-453b-8ff9-902f0c06bc60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3394c052-5c52-49bf-8c54-0ed3d2c3c121" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_58425371-52f6-453b-8ff9-902f0c06bc60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_58425371-52f6-453b-8ff9-902f0c06bc60_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_58425371-52f6-453b-8ff9-902f0c06bc60" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_58425371-52f6-453b-8ff9-902f0c06bc60_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ba51a44a-3e19-441c-b4b0-8ffd8f081ee5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_58425371-52f6-453b-8ff9-902f0c06bc60" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ba51a44a-3e19-441c-b4b0-8ffd8f081ee5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_ebd4c6de-b26a-4d13-a152-8567ab46b48e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ba51a44a-3e19-441c-b4b0-8ffd8f081ee5" xlink:to="loc_us-gaap_LoansPayableMember_ebd4c6de-b26a-4d13-a152-8567ab46b48e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#DerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/DerivativeInstrumentsDetails" xlink:type="extended" id="i9336b0e75ec64978bf7777ac1a0a959b_DerivativeInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_e7da51ce-9b4e-47b7-863d-12fa42c2b770" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_b17ce702-eaac-4f1f-9422-051c79f2cd61" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e7da51ce-9b4e-47b7-863d-12fa42c2b770" xlink:to="loc_us-gaap_DerivativeNotionalAmount_b17ce702-eaac-4f1f-9422-051c79f2cd61" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_08063e32-906f-4273-9c6b-8dcbf287929a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e7da51ce-9b4e-47b7-863d-12fa42c2b770" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_08063e32-906f-4273-9c6b-8dcbf287929a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet_963852e5-2af2-420c-94bc-fa809d9dac13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e7da51ce-9b4e-47b7-863d-12fa42c2b770" xlink:to="loc_us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet_963852e5-2af2-420c-94bc-fa809d9dac13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_97a91d93-18de-4db6-b8dd-62e27c5a3663" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_e7da51ce-9b4e-47b7-863d-12fa42c2b770" xlink:to="loc_us-gaap_DerivativeTable_97a91d93-18de-4db6-b8dd-62e27c5a3663" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_c5502d90-adcc-4299-9e7f-9d6b2871a058" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_97a91d93-18de-4db6-b8dd-62e27c5a3663" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_c5502d90-adcc-4299-9e7f-9d6b2871a058" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_c5502d90-adcc-4299-9e7f-9d6b2871a058_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_c5502d90-adcc-4299-9e7f-9d6b2871a058" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_c5502d90-adcc-4299-9e7f-9d6b2871a058_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_31855744-59b3-4bc5-a387-e01359422648" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_c5502d90-adcc-4299-9e7f-9d6b2871a058" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_31855744-59b3-4bc5-a387-e01359422648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_517a3369-733f-494e-a3a9-6d75f9ed22c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_31855744-59b3-4bc5-a387-e01359422648" xlink:to="loc_us-gaap_InterestRateSwapMember_517a3369-733f-494e-a3a9-6d75f9ed22c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_dd864fa3-e578-4d1a-9f09-a6a5f9cdd919" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_31855744-59b3-4bc5-a387-e01359422648" xlink:to="loc_us-gaap_ForeignExchangeContractMember_dd864fa3-e578-4d1a-9f09-a6a5f9cdd919" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsFairValueofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#DerivativeInstrumentsFairValueofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/DerivativeInstrumentsFairValueofDerivativeInstrumentsDetails" xlink:type="extended" id="i129bde7023cb45c9a4cc577879a476f7_DerivativeInstrumentsFairValueofDerivativeInstrumentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue_bbac74bd-c3d0-4af8-8c37-8f5a08f91f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:to="loc_us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue_bbac74bd-c3d0-4af8-8c37-8f5a08f91f3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsCurrent_93fa9be7-39da-4374-af2d-7556330dda92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:to="loc_us-gaap_DerivativeAssetsCurrent_93fa9be7-39da-4374-af2d-7556330dda92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsNoncurrent_7ad6c0d4-da73-434b-b592-c97c22dce9b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:to="loc_us-gaap_DerivativeAssetsNoncurrent_7ad6c0d4-da73-434b-b592-c97c22dce9b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_33f2fec0-7bcc-48ad-821c-e84b3ba74897" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral_33f2fec0-7bcc-48ad-821c-e84b3ba74897" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration_f59ed4c6-8749-4d16-ab37-ca6bba176ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:to="loc_us-gaap_DerivativeAssetCurrentStatementOfFinancialPositionExtensibleEnumeration_f59ed4c6-8749-4d16-ab37-ca6bba176ca3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetNoncurrentStatementOfFinancialPositionExtensibleEnumeration_82763d7c-316e-4d9f-8246-72fd9b7a56fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetNoncurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:to="loc_us-gaap_DerivativeAssetNoncurrentStatementOfFinancialPositionExtensibleEnumeration_82763d7c-316e-4d9f-8246-72fd9b7a56fe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_7f044f05-91e5-4c50-b496-d7aa991b012f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_1463a920-2234-42e1-afe7-864144e3d28c" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_7f044f05-91e5-4c50-b496-d7aa991b012f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_a8723a5a-1dab-43ca-9a1d-c94dfff9fa42" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_7f044f05-91e5-4c50-b496-d7aa991b012f" xlink:to="loc_us-gaap_HedgingDesignationAxis_a8723a5a-1dab-43ca-9a1d-c94dfff9fa42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_a8723a5a-1dab-43ca-9a1d-c94dfff9fa42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_a8723a5a-1dab-43ca-9a1d-c94dfff9fa42" xlink:to="loc_us-gaap_HedgingDesignationDomain_a8723a5a-1dab-43ca-9a1d-c94dfff9fa42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_a81bd99a-2f29-4d74-b494-4dc58545c173" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_a8723a5a-1dab-43ca-9a1d-c94dfff9fa42" xlink:to="loc_us-gaap_HedgingDesignationDomain_a81bd99a-2f29-4d74-b494-4dc58545c173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cac49dc8-8d96-40b7-89c4-c2a2a9a888cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_a81bd99a-2f29-4d74-b494-4dc58545c173" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_cac49dc8-8d96-40b7-89c4-c2a2a9a888cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_89f012c9-cde6-4745-b948-1793e03a50fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_7f044f05-91e5-4c50-b496-d7aa991b012f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_89f012c9-cde6-4745-b948-1793e03a50fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_89f012c9-cde6-4745-b948-1793e03a50fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_89f012c9-cde6-4745-b948-1793e03a50fc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_89f012c9-cde6-4745-b948-1793e03a50fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_f0c5c747-293c-4ee7-ad4e-5a2107ae0a92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_89f012c9-cde6-4745-b948-1793e03a50fc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_f0c5c747-293c-4ee7-ad4e-5a2107ae0a92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_a288b4fa-fa89-4558-a9ab-b71f13d66429" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f0c5c747-293c-4ee7-ad4e-5a2107ae0a92" xlink:to="loc_us-gaap_ForeignExchangeContractMember_a288b4fa-fa89-4558-a9ab-b71f13d66429" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_4a590f85-094e-41c5-af76-e9b1109de6e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_f0c5c747-293c-4ee7-ad4e-5a2107ae0a92" xlink:to="loc_us-gaap_InterestRateSwapMember_4a590f85-094e-41c5-af76-e9b1109de6e6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/DerivativeInstrumentsEffectsofDerivativeInstrumentsinCashFlowHedgingRelationshipsDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#DerivativeInstrumentsEffectsofDerivativeInstrumentsinCashFlowHedgingRelationshipsDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/DerivativeInstrumentsEffectsofDerivativeInstrumentsinCashFlowHedgingRelationshipsDetails" xlink:type="extended" id="ib77557aff4b141f3a96fb1e920ed85e8_DerivativeInstrumentsEffectsofDerivativeInstrumentsinCashFlowHedgingRelationshipsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_524f4d76-98a0-4eec-819a-60ba69c778b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_d04c51f2-b6eb-4c4e-9fcf-0ea7a97fa21c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_524f4d76-98a0-4eec-819a-60ba69c778b5" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_d04c51f2-b6eb-4c4e-9fcf-0ea7a97fa21c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_8edb4f8b-6aa5-4200-acc6-3b5d31199a24" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_524f4d76-98a0-4eec-819a-60ba69c778b5" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_8edb4f8b-6aa5-4200-acc6-3b5d31199a24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentGainLossReclassifiedFromAociIntoIncomeEffectivePortionStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_3b532ec9-107e-4e04-b651-c289d80f195a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentGainLossReclassifiedFromAociIntoIncomeEffectivePortionStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_524f4d76-98a0-4eec-819a-60ba69c778b5" xlink:to="loc_us-gaap_DerivativeInstrumentGainLossReclassifiedFromAociIntoIncomeEffectivePortionStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_3b532ec9-107e-4e04-b651-c289d80f195a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0150df54-1d8b-4ae1-b19c-7b33865b9cb9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_524f4d76-98a0-4eec-819a-60ba69c778b5" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0150df54-1d8b-4ae1-b19c-7b33865b9cb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_e9dc6a1f-356a-4826-817a-7d475990253b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0150df54-1d8b-4ae1-b19c-7b33865b9cb9" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_e9dc6a1f-356a-4826-817a-7d475990253b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_e9dc6a1f-356a-4826-817a-7d475990253b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_e9dc6a1f-356a-4826-817a-7d475990253b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_e9dc6a1f-356a-4826-817a-7d475990253b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_eb470ff4-65e1-4265-a428-8347549cff9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_e9dc6a1f-356a-4826-817a-7d475990253b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_eb470ff4-65e1-4265-a428-8347549cff9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_52d9d547-673e-4bc1-9143-a788ee96eada" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_eb470ff4-65e1-4265-a428-8347549cff9f" xlink:to="loc_us-gaap_InterestRateSwapMember_52d9d547-673e-4bc1-9143-a788ee96eada" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_b86147c1-3bf4-4511-88a6-18bf62c4f471" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_eb470ff4-65e1-4265-a428-8347549cff9f" xlink:to="loc_us-gaap_ForeignExchangeContractMember_b86147c1-3bf4-4511-88a6-18bf62c4f471" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_baa349b9-4c5b-4dfc-a92d-7cf448663278" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_0150df54-1d8b-4ae1-b19c-7b33865b9cb9" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_baa349b9-4c5b-4dfc-a92d-7cf448663278" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_baa349b9-4c5b-4dfc-a92d-7cf448663278_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_baa349b9-4c5b-4dfc-a92d-7cf448663278" xlink:to="loc_us-gaap_HedgingRelationshipDomain_baa349b9-4c5b-4dfc-a92d-7cf448663278_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_47192022-05a2-417d-b93e-daf1ef132ec8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_baa349b9-4c5b-4dfc-a92d-7cf448663278" xlink:to="loc_us-gaap_HedgingRelationshipDomain_47192022-05a2-417d-b93e-daf1ef132ec8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_7c775b82-d7f4-4dc3-b786-f2d90deec7b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_47192022-05a2-417d-b93e-daf1ef132ec8" xlink:to="loc_us-gaap_CashFlowHedgingMember_7c775b82-d7f4-4dc3-b786-f2d90deec7b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_514674df-3f6c-4b51-918c-bcc1f823d275" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_47192022-05a2-417d-b93e-daf1ef132ec8" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_514674df-3f6c-4b51-918c-bcc1f823d275" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/CommitmentsandContingenciesDetails" xlink:type="extended" id="ifc90e764ed404513850688d361f93a05_CommitmentsandContingenciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentLineItems_05fc71a5-f34e-4885-a5d1-0f2821260842" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermPurchaseCommitmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_LongtermPurchaseCommitmentRemainingMinimumAmountCommitted_3c0353a1-d92a-4d96-9add-bc8b36355c34" xlink:href="blkb-20220930.xsd#blkb_LongtermPurchaseCommitmentRemainingMinimumAmountCommitted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_05fc71a5-f34e-4885-a5d1-0f2821260842" xlink:to="loc_blkb_LongtermPurchaseCommitmentRemainingMinimumAmountCommitted_3c0353a1-d92a-4d96-9add-bc8b36355c34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentTable_ce9c4598-bcd7-40fd-bd1a-13052b053830" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermPurchaseCommitmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentLineItems_05fc71a5-f34e-4885-a5d1-0f2821260842" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentTable_ce9c4598-bcd7-40fd-bd1a-13052b053830" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_0720b799-604b-4d7e-9d71-b64e7b4b8501" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentTable_ce9c4598-bcd7-40fd-bd1a-13052b053830" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_0720b799-604b-4d7e-9d71-b64e7b4b8501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_0720b799-604b-4d7e-9d71-b64e7b4b8501_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_0720b799-604b-4d7e-9d71-b64e7b4b8501" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_0720b799-604b-4d7e-9d71-b64e7b4b8501_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_12281819-24f1-4b13-953b-3029d56ac36f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis_0720b799-604b-4d7e-9d71-b64e7b4b8501" xlink:to="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_12281819-24f1-4b13-953b-3029d56ac36f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_ThirdpartyTechnologyMember_c2c0cfcf-76e9-49e0-abe1-8ebf8868c1ea" xlink:href="blkb-20220930.xsd#blkb_ThirdpartyTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermPurchaseCommitmentCategoryOfItemPurchasedDomain_12281819-24f1-4b13-953b-3029d56ac36f" xlink:to="loc_blkb_ThirdpartyTechnologyMember_c2c0cfcf-76e9-49e0-abe1-8ebf8868c1ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_LiabilityInsuranceAmountTotal_b49383eb-888f-4bc1-8f25-bd6770650c69" xlink:href="blkb-20220930.xsd#blkb_LiabilityInsuranceAmountTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_blkb_LiabilityInsuranceAmountTotal_b49383eb-888f-4bc1-8f25-bd6770650c69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_LiabilityInsuranceAmountDeductible_a60ec43f-00c3-4044-8ae4-87066ed8c666" xlink:href="blkb-20220930.xsd#blkb_LiabilityInsuranceAmountDeductible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_blkb_LiabilityInsuranceAmountDeductible_a60ec43f-00c3-4044-8ae4-87066ed8c666" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_SecurityIncidentExpectedCost_fb4dd95e-cc09-4b4d-85e5-cbde2fe88678" xlink:href="blkb-20220930.xsd#blkb_SecurityIncidentExpectedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_blkb_SecurityIncidentExpectedCost_fb4dd95e-cc09-4b4d-85e5-cbde2fe88678" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_ExpectedNetCashOutlaysForOngoingLegalFees_f9e7db53-1ee0-47b4-89ba-287e406af380" xlink:href="blkb-20220930.xsd#blkb_ExpectedNetCashOutlaysForOngoingLegalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_blkb_ExpectedNetCashOutlaysForOngoingLegalFees_f9e7db53-1ee0-47b4-89ba-287e406af380" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_22700ad0-2cc9-4ac5-a5ad-4ceb6ef6e693" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_22700ad0-2cc9-4ac5-a5ad-4ceb6ef6e693" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfPlaintiffs_c7e2e594-7c66-4698-8034-4fe76e4c7a2e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNumberOfPlaintiffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_us-gaap_LossContingencyNumberOfPlaintiffs_c7e2e594-7c66-4698-8034-4fe76e4c7a2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_82b93f29-f6d0-4c54-ae2d-55eb37908411" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyPendingClaimsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_82b93f29-f6d0-4c54-ae2d-55eb37908411" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyClaimsSettledNumber_a57176dc-6844-4001-bb42-45dd02cdefbd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyClaimsSettledNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_us-gaap_LossContingencyClaimsSettledNumber_a57176dc-6844-4001-bb42-45dd02cdefbd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_SecurityIncidentNumberOfStateAttorneysGeneral_1b6a3285-3105-44ce-88af-a2a850594611" xlink:href="blkb-20220930.xsd#blkb_SecurityIncidentNumberOfStateAttorneysGeneral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_blkb_SecurityIncidentNumberOfStateAttorneysGeneral_1b6a3285-3105-44ce-88af-a2a850594611" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_SecurityIncidentPenaltyPaid_41ccbe27-b580-479d-89b0-f93c10d54423" xlink:href="blkb-20220930.xsd#blkb_SecurityIncidentPenaltyPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_blkb_SecurityIncidentPenaltyPaid_41ccbe27-b580-479d-89b0-f93c10d54423" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_39dbd6ba-ab0e-413d-a8d5-951e155458da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_72e6593b-a0ba-45b8-9a62-80c32feae99d" xlink:to="loc_us-gaap_LossContingenciesTable_39dbd6ba-ab0e-413d-a8d5-951e155458da" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_44b0c918-9370-46cc-ac25-0ae2ef8fa6e7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_39dbd6ba-ab0e-413d-a8d5-951e155458da" xlink:to="loc_srt_LitigationCaseAxis_44b0c918-9370-46cc-ac25-0ae2ef8fa6e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_44b0c918-9370-46cc-ac25-0ae2ef8fa6e7_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_44b0c918-9370-46cc-ac25-0ae2ef8fa6e7" xlink:to="loc_srt_LitigationCaseTypeDomain_44b0c918-9370-46cc-ac25-0ae2ef8fa6e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_d5a032ba-39f9-46fd-977e-1f43b0f3d608" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_44b0c918-9370-46cc-ac25-0ae2ef8fa6e7" xlink:to="loc_srt_LitigationCaseTypeDomain_d5a032ba-39f9-46fd-977e-1f43b0f3d608" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_PutativeConsumerClassActionCasesMember_83d661ce-6c5e-4cdf-8bdb-5dcce113deba" xlink:href="blkb-20220930.xsd#blkb_PutativeConsumerClassActionCasesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_d5a032ba-39f9-46fd-977e-1f43b0f3d608" xlink:to="loc_blkb_PutativeConsumerClassActionCasesMember_83d661ce-6c5e-4cdf-8bdb-5dcce113deba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_PutativeConsumerClassActionCasesCanadianCourtsMember_c321b2ff-85b0-4ab9-b436-6a817e76ac28" xlink:href="blkb-20220930.xsd#blkb_PutativeConsumerClassActionCasesCanadianCourtsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_d5a032ba-39f9-46fd-977e-1f43b0f3d608" xlink:to="loc_blkb_PutativeConsumerClassActionCasesCanadianCourtsMember_c321b2ff-85b0-4ab9-b436-6a817e76ac28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_PutativeConsumerClassActionCasesUSFederalCourtsMember_8b10bfab-8c20-4e99-9fee-54840ca94df2" xlink:href="blkb-20220930.xsd#blkb_PutativeConsumerClassActionCasesUSFederalCourtsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_d5a032ba-39f9-46fd-977e-1f43b0f3d608" xlink:to="loc_blkb_PutativeConsumerClassActionCasesUSFederalCourtsMember_8b10bfab-8c20-4e99-9fee-54840ca94df2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_f784c0f0-7f78-4cf6-95e5-290b3cd29bbc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_39dbd6ba-ab0e-413d-a8d5-951e155458da" xlink:to="loc_srt_RangeAxis_f784c0f0-7f78-4cf6-95e5-290b3cd29bbc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f784c0f0-7f78-4cf6-95e5-290b3cd29bbc_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_f784c0f0-7f78-4cf6-95e5-290b3cd29bbc" xlink:to="loc_srt_RangeMember_f784c0f0-7f78-4cf6-95e5-290b3cd29bbc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6fa6b51d-f06b-4b3e-a929-419ccd9775db" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_f784c0f0-7f78-4cf6-95e5-290b3cd29bbc" xlink:to="loc_srt_RangeMember_6fa6b51d-f06b-4b3e-a929-419ccd9775db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_8aa3a2f6-a592-49ac-8e64-c666e769a126" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6fa6b51d-f06b-4b3e-a929-419ccd9775db" xlink:to="loc_srt_MinimumMember_8aa3a2f6-a592-49ac-8e64-c666e769a126" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a6940216-8fe5-4705-9636-156020aa4429" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6fa6b51d-f06b-4b3e-a929-419ccd9775db" xlink:to="loc_srt_MaximumMember_a6940216-8fe5-4705-9636-156020aa4429" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_4a0ab680-ea84-4dd4-94d0-fe119407b354" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_39dbd6ba-ab0e-413d-a8d5-951e155458da" xlink:to="loc_srt_StatementGeographicalAxis_4a0ab680-ea84-4dd4-94d0-fe119407b354" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_4a0ab680-ea84-4dd4-94d0-fe119407b354_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_4a0ab680-ea84-4dd4-94d0-fe119407b354" xlink:to="loc_srt_SegmentGeographicalDomain_4a0ab680-ea84-4dd4-94d0-fe119407b354_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_74e7ea9f-d671-42e7-a2b4-5cab63f6e99f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_4a0ab680-ea84-4dd4-94d0-fe119407b354" xlink:to="loc_srt_SegmentGeographicalDomain_74e7ea9f-d671-42e7-a2b4-5cab63f6e99f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_ES_87e56511-c596-435f-aebf-74e5d18194c2" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_ES"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_74e7ea9f-d671-42e7-a2b4-5cab63f6e99f" xlink:to="loc_country_ES_87e56511-c596-435f-aebf-74e5d18194c2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails" xlink:type="extended" id="ibc2cbd643a6542d79e013366fedc8e29_StockholdersEquityChangesinAccumulatedOtherComprehensiveLossbyComponentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7becead6-b198-47fb-b565-8dad93c1e0de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:href="blkb-20220930.xsd#blkb_AccumulatedOtherComprehensiveIncomeRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7becead6-b198-47fb-b565-8dad93c1e0de" xlink:to="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_2d993d18-fed8-4b59-841e-64e4f5a80039" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_2d993d18-fed8-4b59-841e-64e4f5a80039" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_487561f1-e06d-435b-9319-52dad2b45cdd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_487561f1-e06d-435b-9319-52dad2b45cdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_061a0a8d-a447-4ca3-b420-8a0eb3aa369e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_061a0a8d-a447-4ca3-b420-8a0eb3aa369e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_cc784b9b-b2e9-4c65-8fd5-a678d0d15f6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_cc784b9b-b2e9-4c65-8fd5-a678d0d15f6c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_a9ced7f1-61a0-4100-becc-d3077331d689" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_a9ced7f1-61a0-4100-becc-d3077331d689" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_bc46e6f8-2e43-46ea-accb-c2588ecb6e00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_bc46e6f8-2e43-46ea-accb-c2588ecb6e00" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_24618385-e1fa-4dbd-a9cd-6aad4128d13b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_24618385-e1fa-4dbd-a9cd-6aad4128d13b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_62ba9df1-d7be-48f4-9577-fe4c4e506e62" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_blkb_AccumulatedOtherComprehensiveIncomeRollForward_c56e7f95-3d62-4b3d-bd26-cfa4bf8b9f98" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_62ba9df1-d7be-48f4-9577-fe4c4e506e62" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_4e4b1a37-4065-4205-8129-650063572d8b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_07557ad9-e701-4df9-9e1a-13fcd25cc01e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7becead6-b198-47fb-b565-8dad93c1e0de" xlink:to="loc_us-gaap_StatementTable_07557ad9-e701-4df9-9e1a-13fcd25cc01e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_0aed95aa-85c7-4ce5-a309-18edf772397c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_07557ad9-e701-4df9-9e1a-13fcd25cc01e" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_0aed95aa-85c7-4ce5-a309-18edf772397c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_0aed95aa-85c7-4ce5-a309-18edf772397c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_0aed95aa-85c7-4ce5-a309-18edf772397c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_0aed95aa-85c7-4ce5-a309-18edf772397c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_55c0730c-a92b-4235-abb7-ecf1f8e5e97b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationAxis_0aed95aa-85c7-4ce5-a309-18edf772397c" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_55c0730c-a92b-4235-abb7-ecf1f8e5e97b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_9848ed96-741f-4bc4-ae83-2616c091ba56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_55c0730c-a92b-4235-abb7-ecf1f8e5e97b" xlink:to="loc_us-gaap_CashFlowHedgingMember_9848ed96-741f-4bc4-ae83-2616c091ba56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_fa17eee0-273b-450e-a523-d15cef58fbf8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLocationDomain_55c0730c-a92b-4235-abb7-ecf1f8e5e97b" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_fa17eee0-273b-450e-a523-d15cef58fbf8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/RevenueRecognitionDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#RevenueRecognitionDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/RevenueRecognitionDetails" xlink:type="extended" id="ice11c3c208fd4021aaa0a3cfc677dcfa_RevenueRecognitionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_e12ee9bc-2483-46bd-90ae-fabbbb19c366" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_e12ee9bc-2483-46bd-90ae-fabbbb19c366" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_c67104bd-ad0e-4b4e-a36a-1b2e8e2a8c70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_c67104bd-ad0e-4b4e-a36a-1b2e8e2a8c70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_5ff66a35-b3ea-483a-8d95-a5f81eca28ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_5ff66a35-b3ea-483a-8d95-a5f81eca28ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_dd1dc75e-add3-4565-863a-34b2ad089370" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_dd1dc75e-add3-4565-863a-34b2ad089370" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_e410f04c-e36a-4ca7-b443-ecce4107aa95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_e410f04c-e36a-4ca7-b443-ecce4107aa95" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_24649907-af6a-469b-be6c-a94ae9d4061b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_e410f04c-e36a-4ca7-b443-ecce4107aa95" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_24649907-af6a-469b-be6c-a94ae9d4061b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/RevenueRecognitionDetails_1" xlink:type="simple" xlink:href="blkb-20220930.xsd#RevenueRecognitionDetails_1"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/RevenueRecognitionDetails_1" xlink:type="extended" id="i64239188aae741859738b1252a7a7a7a_RevenueRecognitionDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_e12ee9bc-2483-46bd-90ae-fabbbb19c366" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_e12ee9bc-2483-46bd-90ae-fabbbb19c366" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_c67104bd-ad0e-4b4e-a36a-1b2e8e2a8c70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_c67104bd-ad0e-4b4e-a36a-1b2e8e2a8c70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_5ff66a35-b3ea-483a-8d95-a5f81eca28ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_5ff66a35-b3ea-483a-8d95-a5f81eca28ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_dd1dc75e-add3-4565-863a-34b2ad089370" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_dd1dc75e-add3-4565-863a-34b2ad089370" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_e410f04c-e36a-4ca7-b443-ecce4107aa95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_15da0b9b-b375-4e07-a56e-0e6c5ebc153c" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_e410f04c-e36a-4ca7-b443-ecce4107aa95" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRevenuebyGeographyDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#RevenueRecognitionDisaggregationofRevenuebyGeographyDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRevenuebyGeographyDetails" xlink:type="extended" id="if34b354652f54f9cb45003adf7002d30_RevenueRecognitionDisaggregationofRevenuebyGeographyDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_056ca807-ace2-4073-8d8b-4beefa86058d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d4374879-7eb1-4440-b590-c36f3e309a3f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_056ca807-ace2-4073-8d8b-4beefa86058d" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d4374879-7eb1-4440-b590-c36f3e309a3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_3f82c0eb-cd88-4a36-ad77-6bc7ef54cb76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_056ca807-ace2-4073-8d8b-4beefa86058d" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_3f82c0eb-cd88-4a36-ad77-6bc7ef54cb76" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_782f2cc1-c988-45f7-8f3f-e5143ee6008c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_3f82c0eb-cd88-4a36-ad77-6bc7ef54cb76" xlink:to="loc_srt_StatementGeographicalAxis_782f2cc1-c988-45f7-8f3f-e5143ee6008c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_782f2cc1-c988-45f7-8f3f-e5143ee6008c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_782f2cc1-c988-45f7-8f3f-e5143ee6008c" xlink:to="loc_srt_SegmentGeographicalDomain_782f2cc1-c988-45f7-8f3f-e5143ee6008c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_a5743df4-6c15-42ba-9869-203258ed7877" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_782f2cc1-c988-45f7-8f3f-e5143ee6008c" xlink:to="loc_srt_SegmentGeographicalDomain_a5743df4-6c15-42ba-9869-203258ed7877" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_5d905312-5a92-40ca-a656-afcff9c0817e" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_a5743df4-6c15-42ba-9869-203258ed7877" xlink:to="loc_country_US_5d905312-5a92-40ca-a656-afcff9c0817e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_89191762-a941-44f9-b6a6-d280c05f699e" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_a5743df4-6c15-42ba-9869-203258ed7877" xlink:to="loc_country_GB_89191762-a941-44f9-b6a6-d280c05f699e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_OthercountriesMember_8cae23a1-e44b-4df3-9105-dd99441de9b9" xlink:href="blkb-20220930.xsd#blkb_OthercountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_a5743df4-6c15-42ba-9869-203258ed7877" xlink:to="loc_blkb_OthercountriesMember_8cae23a1-e44b-4df3-9105-dd99441de9b9" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRevenuebyMarketGroupDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#RevenueRecognitionDisaggregationofRevenuebyMarketGroupDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRevenuebyMarketGroupDetails" xlink:type="extended" id="i8891f84dfbc34177b905ff98fb8b8053_RevenueRecognitionDisaggregationofRevenuebyMarketGroupDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_258d8b28-992a-4108-81ee-65b064569df0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a9e1290f-cf06-48b3-a35d-24efcea741e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_258d8b28-992a-4108-81ee-65b064569df0" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_a9e1290f-cf06-48b3-a35d-24efcea741e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_6675240e-06de-4ba4-8545-18fe4e651bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_258d8b28-992a-4108-81ee-65b064569df0" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_6675240e-06de-4ba4-8545-18fe4e651bdd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_b07d31da-a995-4455-b088-7374809d9033" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_6675240e-06de-4ba4-8545-18fe4e651bdd" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_b07d31da-a995-4455-b088-7374809d9033" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b07d31da-a995-4455-b088-7374809d9033_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b07d31da-a995-4455-b088-7374809d9033" xlink:to="loc_us-gaap_SegmentDomain_b07d31da-a995-4455-b088-7374809d9033_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_649e691c-efba-4b20-bc75-956c7fc271a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_b07d31da-a995-4455-b088-7374809d9033" xlink:to="loc_us-gaap_SegmentDomain_649e691c-efba-4b20-bc75-956c7fc271a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_SocialSectorMember_c933ce8e-a861-4dd3-b5ad-94f726d4e0ce" xlink:href="blkb-20220930.xsd#blkb_SocialSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_649e691c-efba-4b20-bc75-956c7fc271a1" xlink:to="loc_blkb_SocialSectorMember_c933ce8e-a861-4dd3-b5ad-94f726d4e0ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_CorporateSectorMember_390c2a16-6e54-49e3-b858-8e262919a34b" xlink:href="blkb-20220930.xsd#blkb_CorporateSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_649e691c-efba-4b20-bc75-956c7fc271a1" xlink:to="loc_blkb_CorporateSectorMember_390c2a16-6e54-49e3-b858-8e262919a34b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllOtherSegmentsMember_1ec2706a-0c8a-4f72-9b6b-bb4b96e7a7dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllOtherSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_649e691c-efba-4b20-bc75-956c7fc271a1" xlink:to="loc_us-gaap_AllOtherSegmentsMember_1ec2706a-0c8a-4f72-9b6b-bb4b96e7a7dc" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRecurringRevenuebyTypeDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#RevenueRecognitionDisaggregationofRecurringRevenuebyTypeDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/RevenueRecognitionDisaggregationofRecurringRevenuebyTypeDetails" xlink:type="extended" id="i1436db25ad144d678ea7126fe3f1e4bd_RevenueRecognitionDisaggregationofRecurringRevenuebyTypeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_a0208f27-0e23-4b63-bbf0-6772992b2c60" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_bddcc1eb-a97b-4bfe-97d7-5006b6760006" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a0208f27-0e23-4b63-bbf0-6772992b2c60" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_bddcc1eb-a97b-4bfe-97d7-5006b6760006" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_35be9702-3492-484f-9639-dbad969e9792" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_a0208f27-0e23-4b63-bbf0-6772992b2c60" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_35be9702-3492-484f-9639-dbad969e9792" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_fd8f86b5-1140-4d77-a2cd-b46404774084" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_35be9702-3492-484f-9639-dbad969e9792" xlink:to="loc_srt_ProductOrServiceAxis_fd8f86b5-1140-4d77-a2cd-b46404774084" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_fd8f86b5-1140-4d77-a2cd-b46404774084_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_fd8f86b5-1140-4d77-a2cd-b46404774084" xlink:to="loc_srt_ProductsAndServicesDomain_fd8f86b5-1140-4d77-a2cd-b46404774084_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_ad8cf1b9-ebbd-4b0f-93ce-d9787afd68cd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_fd8f86b5-1140-4d77-a2cd-b46404774084" xlink:to="loc_srt_ProductsAndServicesDomain_ad8cf1b9-ebbd-4b0f-93ce-d9787afd68cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_ContractualRecurringMember_d94fdddb-6a4d-4f51-a35a-3401d08280a5" xlink:href="blkb-20220930.xsd#blkb_ContractualRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_ad8cf1b9-ebbd-4b0f-93ce-d9787afd68cd" xlink:to="loc_blkb_ContractualRecurringMember_d94fdddb-6a4d-4f51-a35a-3401d08280a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_TransactionalRecurringMember_55edfc45-03ea-4f8d-aafa-a66c61cf0e40" xlink:href="blkb-20220930.xsd#blkb_TransactionalRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_ad8cf1b9-ebbd-4b0f-93ce-d9787afd68cd" xlink:to="loc_blkb_TransactionalRecurringMember_55edfc45-03ea-4f8d-aafa-a66c61cf0e40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_RecurringMember_2b252dfb-d99c-4595-b521-d4f5faf909c7" xlink:href="blkb-20220930.xsd#blkb_RecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_ad8cf1b9-ebbd-4b0f-93ce-d9787afd68cd" xlink:to="loc_blkb_RecurringMember_2b252dfb-d99c-4595-b521-d4f5faf909c7" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.blackbaud.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="blkb-20220930.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://www.blackbaud.com/role/SubsequentEventsDetails" xlink:type="extended" id="i7202e5fa023f47b88bc5631247379d5a_SubsequentEventsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_f8612b77-2828-421f-bcd9-e5aecd72f826" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_19229646-bcbf-49f0-82b2-f96718a0779e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_f8612b77-2828-421f-bcd9-e5aecd72f826" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_19229646-bcbf-49f0-82b2-f96718a0779e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_334a3f85-e131-4924-bb1a-86a0710c4314" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_f8612b77-2828-421f-bcd9-e5aecd72f826" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_334a3f85-e131-4924-bb1a-86a0710c4314" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_RightsAgreementOwnershipLimitPercent_77d04893-2cb9-4ae9-8d3b-5b57babb115a" xlink:href="blkb-20220930.xsd#blkb_RightsAgreementOwnershipLimitPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_f8612b77-2828-421f-bcd9-e5aecd72f826" xlink:to="loc_blkb_RightsAgreementOwnershipLimitPercent_77d04893-2cb9-4ae9-8d3b-5b57babb115a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_4d5ebb97-faa3-46f5-a9f3-66865a655f12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_f8612b77-2828-421f-bcd9-e5aecd72f826" xlink:to="loc_us-gaap_SubsequentEventTable_4d5ebb97-faa3-46f5-a9f3-66865a655f12" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_73528253-0121-4b99-8372-f9bb4b9e8f35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_4d5ebb97-faa3-46f5-a9f3-66865a655f12" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_73528253-0121-4b99-8372-f9bb4b9e8f35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_73528253-0121-4b99-8372-f9bb4b9e8f35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_73528253-0121-4b99-8372-f9bb4b9e8f35" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_73528253-0121-4b99-8372-f9bb4b9e8f35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_cc174abf-0507-4769-a1b5-7ff675458a84" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_73528253-0121-4b99-8372-f9bb4b9e8f35" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_cc174abf-0507-4769-a1b5-7ff675458a84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_57793e18-e38e-4432-bcb2-d9402ea70211" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_cc174abf-0507-4769-a1b5-7ff675458a84" xlink:to="loc_us-gaap_SubsequentEventMember_57793e18-e38e-4432-bcb2-d9402ea70211" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3ceeea0c-f26b-46b5-9a32-831f84428725" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_4d5ebb97-faa3-46f5-a9f3-66865a655f12" xlink:to="loc_srt_RangeAxis_3ceeea0c-f26b-46b5-9a32-831f84428725" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3ceeea0c-f26b-46b5-9a32-831f84428725_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3ceeea0c-f26b-46b5-9a32-831f84428725" xlink:to="loc_srt_RangeMember_3ceeea0c-f26b-46b5-9a32-831f84428725_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e7bfe205-cd58-4069-8869-8b7de42e0632" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3ceeea0c-f26b-46b5-9a32-831f84428725" xlink:to="loc_srt_RangeMember_e7bfe205-cd58-4069-8869-8b7de42e0632" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_4551d930-65de-412d-865e-a529f7a8495c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e7bfe205-cd58-4069-8869-8b7de42e0632" xlink:to="loc_srt_MinimumMember_4551d930-65de-412d-865e-a529f7a8495c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2c4e72d7-3242-4c96-8a92-99ee7b2a287e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e7bfe205-cd58-4069-8869-8b7de42e0632" xlink:to="loc_srt_MaximumMember_2c4e72d7-3242-4c96-8a92-99ee7b2a287e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_3bdf0aaf-5339-4454-98ac-21f2f1759bbe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_4d5ebb97-faa3-46f5-a9f3-66865a655f12" xlink:to="loc_us-gaap_StatementClassOfStockAxis_3bdf0aaf-5339-4454-98ac-21f2f1759bbe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_3bdf0aaf-5339-4454-98ac-21f2f1759bbe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3bdf0aaf-5339-4454-98ac-21f2f1759bbe" xlink:to="loc_us-gaap_ClassOfStockDomain_3bdf0aaf-5339-4454-98ac-21f2f1759bbe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_8e12fb93-ac26-4ce8-bb72-abfbae6060e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_3bdf0aaf-5339-4454-98ac-21f2f1759bbe" xlink:to="loc_us-gaap_ClassOfStockDomain_8e12fb93-ac26-4ce8-bb72-abfbae6060e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_9c2cd6d9-bf2a-4b37-994d-9341b35dc51b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8e12fb93-ac26-4ce8-bb72-abfbae6060e9" xlink:to="loc_us-gaap_SubsequentEventMember_9c2cd6d9-bf2a-4b37-994d-9341b35dc51b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_SeriesAJuniorParticipatingPreferredStockMember_2291efac-343a-4f3e-b0c2-9dd42f8c1cc4" xlink:href="blkb-20220930.xsd#blkb_SeriesAJuniorParticipatingPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8e12fb93-ac26-4ce8-bb72-abfbae6060e9" xlink:to="loc_blkb_SeriesAJuniorParticipatingPreferredStockMember_2291efac-343a-4f3e-b0c2-9dd42f8c1cc4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_blkb_AccruedExpensesAndOtherCurrentLiabilities_af912ab6-f551-40cf-b855-187da357fca3" xlink:href="blkb-20220930.xsd#blkb_AccruedExpensesAndOtherCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_blkb_AccruedExpensesAndOtherCurrentLiabilities_af912ab6-f551-40cf-b855-187da357fca3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:type="arc" order="0"/>
  </link:definitionLink>
</link:linkbase>
