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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019c76d3-b3e9-7baa-b91a-bee365958e17,g:82feda92-6522-4e6b-89ec-aa9d73dbcaf6-->
<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://riskified.com/role/Cover" xlink:type="simple" xlink:href="rskd-20251231.xsd#Cover"/>
  <link:definitionLink xlink:role="http://riskified.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019c76d3-b4fe-765e-afc1-d42f26f5a16e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentInformationTable_019c76d3-b4fe-765e-afc1-d42f26f5a16e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressesAddressTypeAxis_019c76d3-b4fe-7f20-8e5c-d2b9a820a33f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressesAddressTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019c76d3-b4fe-765e-afc1-d42f26f5a16e" xlink:to="loc_dei_EntityAddressesAddressTypeAxis_019c76d3-b4fe-7f20-8e5c-d2b9a820a33f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019c76d3-b4fe-7f20-8e5c-d2b9a820a33f_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019c76d3-b4fe-7f20-8e5c-d2b9a820a33f" xlink:to="loc_dei_AddressTypeDomain_019c76d3-b4fe-7f20-8e5c-d2b9a820a33f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AddressTypeDomain_019c76d3-b4fe-7530-9d1d-ef57370e3e71" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AddressTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityAddressesAddressTypeAxis_019c76d3-b4fe-7f20-8e5c-d2b9a820a33f" xlink:to="loc_dei_AddressTypeDomain_019c76d3-b4fe-7530-9d1d-ef57370e3e71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_BusinessContactMember_019c76d3-b4fe-7d91-ac0c-b4d0cba7b638" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_BusinessContactMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_AddressTypeDomain_019c76d3-b4fe-7530-9d1d-ef57370e3e71" xlink:to="loc_dei_BusinessContactMember_019c76d3-b4fe-7d91-ac0c-b4d0cba7b638" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b4fe-7a3d-9295-a3ef909d3d92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019c76d3-b4fe-765e-afc1-d42f26f5a16e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b4fe-7a3d-9295-a3ef909d3d92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b4fe-7a3d-9295-a3ef909d3d92_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b4fe-7a3d-9295-a3ef909d3d92" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b4fe-7a3d-9295-a3ef909d3d92_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b4fe-7342-afbf-db99c997410d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b4fe-7a3d-9295-a3ef909d3d92" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b4fe-7342-afbf-db99c997410d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b4fe-7bd1-baeb-1d71d23f5b96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b4fe-7342-afbf-db99c997410d" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b4fe-7bd1-baeb-1d71d23f5b96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b4fe-7cd2-a689-ef33757268dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b4fe-7342-afbf-db99c997410d" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b4fe-7cd2-a689-ef33757268dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019c76d3-b4fe-7670-998c-f9307b39128a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentType_019c76d3-b4fe-7670-998c-f9307b39128a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentRegistrationStatement_019c76d3-b4fe-743a-9513-841bc208360e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentRegistrationStatement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentRegistrationStatement_019c76d3-b4fe-743a-9513-841bc208360e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_019c76d3-b4fe-7f51-9efc-04161b697e99" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAnnualReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentAnnualReport_019c76d3-b4fe-7f51-9efc-04161b697e99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019c76d3-b4fe-7f88-a329-d2612302a5ab" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentPeriodEndDate_019c76d3-b4fe-7f88-a329-d2612302a5ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019c76d3-b4fe-7fbd-a5cd-e614f7713022" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_CurrentFiscalYearEndDate_019c76d3-b4fe-7fbd-a5cd-e614f7713022" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019c76d3-b4fe-7424-ac13-5bb090dae258" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentTransitionReport_019c76d3-b4fe-7424-ac13-5bb090dae258" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentShellCompanyReport_019c76d3-b4fe-71f0-819f-93e613cba0bc" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentShellCompanyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentShellCompanyReport_019c76d3-b4fe-71f0-819f-93e613cba0bc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019c76d3-b4fe-75bb-985f-7bc1f7c43289" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityFileNumber_019c76d3-b4fe-75bb-985f-7bc1f7c43289" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019c76d3-b4fe-7710-9bea-1899d8ac23fd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityRegistrantName_019c76d3-b4fe-7710-9bea-1899d8ac23fd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019c76d3-b4fe-7e38-a814-4001231498be" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019c76d3-b4fe-7e38-a814-4001231498be" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ContactPersonnelName_019c76d3-b4fe-7ed4-a47b-f9fd92baa4e7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_ContactPersonnelName_019c76d3-b4fe-7ed4-a47b-f9fd92baa4e7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019c76d3-b4fe-7c4b-a4f0-8ef33e45b08f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityAddressAddressLine1_019c76d3-b4fe-7c4b-a4f0-8ef33e45b08f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019c76d3-b4fe-7d4b-8007-c86ad930a9e1" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityAddressAddressLine2_019c76d3-b4fe-7d4b-8007-c86ad930a9e1" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019c76d3-b4fe-710b-a290-c7d8654a51f6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityAddressCityOrTown_019c76d3-b4fe-710b-a290-c7d8654a51f6" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019c76d3-b4fe-7e88-a967-e1d5bbda2008" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityAddressStateOrProvince_019c76d3-b4fe-7e88-a967-e1d5bbda2008" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019c76d3-b4fe-70d5-979c-cf77ba3ac8fd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityAddressPostalZipCode_019c76d3-b4fe-70d5-979c-cf77ba3ac8fd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry_019c76d3-b4fe-7cc8-9954-193560d32afb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCountry"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityAddressCountry_019c76d3-b4fe-7cc8-9954-193560d32afb" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ContactPersonnelEmailAddress_019c76d3-b4fe-73a1-b7c3-4b477ceb512e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_ContactPersonnelEmailAddress"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_ContactPersonnelEmailAddress_019c76d3-b4fe-73a1-b7c3-4b477ceb512e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019c76d3-b4fe-7f7e-af2b-3c59e295c23f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_Security12bTitle_019c76d3-b4fe-7f7e-af2b-3c59e295c23f" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019c76d3-b4fe-7c10-8424-4a79c3a8ac2b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_TradingSymbol_019c76d3-b4fe-7c10-8424-4a79c3a8ac2b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019c76d3-b4fe-742a-a322-b8df4543160a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_SecurityExchangeName_019c76d3-b4fe-742a-a322-b8df4543160a" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019c76d3-b4fe-76f0-900d-7fca126f80a7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019c76d3-b4fe-76f0-900d-7fca126f80a7" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_019c76d3-b4fe-7779-ae10-4e2ea2327f1f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_019c76d3-b4fe-7779-ae10-4e2ea2327f1f" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers_019c76d3-b4fe-77ab-a196-98f3719d72cd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityVoluntaryFilers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityVoluntaryFilers_019c76d3-b4fe-77ab-a196-98f3719d72cd" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019c76d3-b4fe-7c21-834a-026ac483f108" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityCurrentReportingStatus_019c76d3-b4fe-7c21-834a-026ac483f108" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019c76d3-b4fe-745b-b75b-cc5767a42499" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityInteractiveDataCurrent_019c76d3-b4fe-745b-b75b-cc5767a42499" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019c76d3-b4fe-7906-a09c-b3bcc542fdda" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityFilerCategory_019c76d3-b4fe-7906-a09c-b3bcc542fdda" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019c76d3-b4fe-7896-9bdc-652baed15157" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityEmergingGrowthCompany_019c76d3-b4fe-7896-9bdc-652baed15157" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_019c76d3-b4fe-743e-b65e-49761ce8bf35" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityExTransitionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityExTransitionPeriod_019c76d3-b4fe-743e-b65e-49761ce8bf35" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag_019c76d3-b4fe-7e10-9ba3-ec1f3c79bdb9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_IcfrAuditorAttestationFlag_019c76d3-b4fe-7e10-9ba3-ec1f3c79bdb9" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtErrorCorrectionFlag_019c76d3-b4fe-7b3b-be0e-f11c5fe608bb" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtErrorCorrectionFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentFinStmtErrorCorrectionFlag_019c76d3-b4fe-7b3b-be0e-f11c5fe608bb" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFinStmtRestatementRecoveryAnalysisFlag_019c76d3-b4fe-7857-9c2c-0c0fd5794ab7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFinStmtRestatementRecoveryAnalysisFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentFinStmtRestatementRecoveryAnalysisFlag_019c76d3-b4fe-7857-9c2c-0c0fd5794ab7" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAccountingStandard_019c76d3-b4fe-7f6c-91d6-54197eea66ee" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentAccountingStandard"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentAccountingStandard_019c76d3-b4fe-7f6c-91d6-54197eea66ee" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019c76d3-b4fe-74df-bf80-a718a823089e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityShellCompany_019c76d3-b4fe-74df-bf80-a718a823089e" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019c76d3-b4fe-7241-9fcb-92e4aa057f2c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_AmendmentFlag_019c76d3-b4fe-7241-9fcb-92e4aa057f2c" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019c76d3-b4fe-7e66-a604-270f9e32359a" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_EntityCentralIndexKey_019c76d3-b4fe-7e66-a604-270f9e32359a" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019c76d3-b4fe-73c6-9508-0c4abcc8a18f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentFiscalYearFocus_019c76d3-b4fe-73c6-9508-0c4abcc8a18f" xlink:type="arc" order="36"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019c76d3-b4fe-7512-9e71-4613d3f65b41" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019c76d3-b4fe-7d5a-a0f9-db77e3a80c7b" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019c76d3-b4fe-7512-9e71-4613d3f65b41" xlink:type="arc" order="37"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="rskd-20251231.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://riskified.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c76d3-b5f5-7f5e-a3ce-75730e648b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c76d3-b5f5-73f9-acd9-1b93252b902c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f5-7f5e-a3ce-75730e648b7f" xlink:to="loc_us-gaap_StatementTable_019c76d3-b5f5-73f9-acd9-1b93252b902c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f5-74f0-830e-cc3e537ca516" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f5-73f9-acd9-1b93252b902c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f5-74f0-830e-cc3e537ca516" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f5-74f0-830e-cc3e537ca516_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f5-74f0-830e-cc3e537ca516" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f5-74f0-830e-cc3e537ca516_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f5-783e-84cc-5b32f237d35f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f5-74f0-830e-cc3e537ca516" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f5-783e-84cc-5b32f237d35f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b5f5-75be-a00b-57fa1c0e7f96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f5-783e-84cc-5b32f237d35f" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b5f5-75be-a00b-57fa1c0e7f96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b5f5-7067-a9cd-ff2d7bc350cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f5-783e-84cc-5b32f237d35f" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b5f5-7067-a9cd-ff2d7bc350cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f5-7f5e-a3ce-75730e648b7f" xlink:to="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:to="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c76d3-b5f5-728e-9832-80f843c4cae2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c76d3-b5f5-728e-9832-80f843c4cae2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositsAssetsCurrent_019c76d3-b5f5-7698-b7e7-91d5af24c5db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositsAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:to="loc_us-gaap_DepositsAssetsCurrent_019c76d3-b5f5-7698-b7e7-91d5af24c5db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019c76d3-b5f5-7eb5-8496-84f9fd910f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019c76d3-b5f5-7eb5-8496-84f9fd910f0b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019c76d3-b5f5-735c-ba6d-3c28f2a970ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019c76d3-b5f5-735c-ba6d-3c28f2a970ca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019c76d3-b5f5-75a5-89f4-0de248ff9d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:to="loc_us-gaap_ShortTermInvestments_019c76d3-b5f5-75a5-89f4-0de248ff9d3f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019c76d3-b5f5-7f19-b991-27191f311fce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019c76d3-b5f5-7cf0-9a26-a446b6d86d82" xlink:to="loc_us-gaap_AssetsCurrent_019c76d3-b5f5-7f19-b991-27191f311fce" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019c76d3-b5f5-7f19-9d01-9553d6df9193" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019c76d3-b5f5-7f19-9d01-9553d6df9193" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c76d3-b5f5-776c-988e-dc983505a501" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c76d3-b5f5-776c-988e-dc983505a501" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019c76d3-b5f5-7bed-8b82-7a0c4275188b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019c76d3-b5f5-7bed-8b82-7a0c4275188b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019c76d3-b5f5-7922-b81c-a9ce7404805a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019c76d3-b5f5-7922-b81c-a9ce7404805a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019c76d3-b5f5-7279-856d-3b7fec8e19c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019c76d3-b5f5-7024-94b5-49ab9a0910d5" xlink:to="loc_us-gaap_Assets_019c76d3-b5f5-7279-856d-3b7fec8e19c0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f5-7f5e-a3ce-75730e648b7f" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019c76d3-b5f5-7474-981d-88fb6a95ba7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_us-gaap_AccountsPayableCurrent_019c76d3-b5f5-7474-981d-88fb6a95ba7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019c76d3-b5f5-753f-b3a4-5ddd33b458b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_019c76d3-b5f5-753f-b3a4-5ddd33b458b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019c76d3-b5f5-77ad-9d61-0c802cb01360" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_019c76d3-b5f5-77ad-9d61-0c802cb01360" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ProvisionForChargebacksCurrent_019c76d3-b5f5-72c4-a73a-3ee82ac20fe9" xlink:href="rskd-20251231.xsd#rskd_ProvisionForChargebacksCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_rskd_ProvisionForChargebacksCurrent_019c76d3-b5f5-72c4-a73a-3ee82ac20fe9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_019c76d3-b5f5-795c-92de-67359d185b87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_019c76d3-b5f5-795c-92de-67359d185b87" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_AccruedLiabilitiesAndOtherLiabilitiesCurrent_019c76d3-b5f5-79ca-a412-18e855378a11" xlink:href="rskd-20251231.xsd#rskd_AccruedLiabilitiesAndOtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_rskd_AccruedLiabilitiesAndOtherLiabilitiesCurrent_019c76d3-b5f5-79ca-a412-18e855378a11" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019c76d3-b5f5-7ab7-8921-fd8c46c3294a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_us-gaap_LiabilitiesCurrent_019c76d3-b5f5-7ab7-8921-fd8c46c3294a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019c76d3-b5f5-74d4-a9ba-85c643da40ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019c76d3-b5f5-7525-9afa-da1229b1a141" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019c76d3-b5f5-74d4-a9ba-85c643da40ab" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_019c76d3-b5f5-7316-9f31-499a4777f55a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_019c76d3-b5f5-7316-9f31-499a4777f55a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019c76d3-b5f5-75fe-91f3-02757a5f9cbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:to="loc_us-gaap_Liabilities_019c76d3-b5f5-75fe-91f3-02757a5f9cbc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019c76d3-b5f5-7fd1-9754-2b752c3d9e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019c76d3-b5f5-7fd1-9754-2b752c3d9e4f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:to="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019c76d3-b5f5-7e96-8cd2-c142a65049da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:to="loc_us-gaap_CommonStockValue_019c76d3-b5f5-7e96-8cd2-c142a65049da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_019c76d3-b5f5-78d6-8dc8-76123a070043" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:to="loc_us-gaap_TreasuryStockValue_019c76d3-b5f5-78d6-8dc8-76123a070043" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019c76d3-b5f5-7c74-a1b8-120a48a2d274" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019c76d3-b5f5-7c74-a1b8-120a48a2d274" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019c76d3-b5f5-7946-9af5-a16f838ca300" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019c76d3-b5f5-7946-9af5-a16f838ca300" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c76d3-b5f5-79cf-9563-b4f5061eb5e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c76d3-b5f5-79cf-9563-b4f5061eb5e3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c76d3-b5f5-71a8-9927-34ce2b441c33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019c76d3-b5f5-7726-ba87-58eca64a6230" xlink:to="loc_us-gaap_StockholdersEquity_019c76d3-b5f5-71a8-9927-34ce2b441c33" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019c76d3-b5f5-7d32-84d5-cc35c40a2558" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019c76d3-b5f5-70ae-bbc4-13bc1b496a7f" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019c76d3-b5f5-7d32-84d5-cc35c40a2558" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="rskd-20251231.xsd#CONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:definitionLink xlink:role="http://riskified.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7782-b34c-bc03f3806b01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c76d3-b5f6-75b0-84a1-20efe6236709" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7782-b34c-bc03f3806b01" xlink:to="loc_us-gaap_StatementTable_019c76d3-b5f6-75b0-84a1-20efe6236709" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7116-870f-a36b998c36f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f6-75b0-84a1-20efe6236709" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7116-870f-a36b998c36f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7116-870f-a36b998c36f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7116-870f-a36b998c36f5" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7116-870f-a36b998c36f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-766c-b347-8602eb8b9aff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7116-870f-a36b998c36f5" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-766c-b347-8602eb8b9aff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-7a22-a652-3999e7ba6547" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-766c-b347-8602eb8b9aff" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-7a22-a652-3999e7ba6547" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-7d2c-aa1a-be7582377df1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-766c-b347-8602eb8b9aff" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-7d2c-aa1a-be7582377df1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019c76d3-b5f6-7b4c-ab6f-048089d677ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7782-b34c-bc03f3806b01" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019c76d3-b5f6-7b4c-ab6f-048089d677ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019c76d3-b5f6-70f8-a951-00a29843ffac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7782-b34c-bc03f3806b01" xlink:to="loc_us-gaap_CommonStockSharesIssued_019c76d3-b5f6-70f8-a951-00a29843ffac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c76d3-b5f6-790a-b950-b42bf6887ff8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7782-b34c-bc03f3806b01" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019c76d3-b5f6-790a-b950-b42bf6887ff8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019c76d3-b5f6-7ce2-8a76-e1a1e22d78c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7782-b34c-bc03f3806b01" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019c76d3-b5f6-7ce2-8a76-e1a1e22d78c5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="rskd-20251231.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:definitionLink xlink:role="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c76d3-b5f6-78a7-938c-fcd1cf346a92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_StatementTable_019c76d3-b5f6-78a7-938c-fcd1cf346a92" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-771f-ad24-34e4256410be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f6-78a7-938c-fcd1cf346a92" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-771f-ad24-34e4256410be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-771f-ad24-34e4256410be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-771f-ad24-34e4256410be" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-771f-ad24-34e4256410be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7cfe-9dd5-adc04221a4fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-771f-ad24-34e4256410be" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7cfe-9dd5-adc04221a4fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-75d7-8d31-c10394852c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7cfe-9dd5-adc04221a4fe" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-75d7-8d31-c10394852c1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-71e3-a331-d92d8576c152" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7cfe-9dd5-adc04221a4fe" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-71e3-a331-d92d8576c152" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c76d3-b5f6-77fb-9ca9-352b45ed5e88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_Revenues_019c76d3-b5f6-77fb-9ca9-352b45ed5e88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenue_019c76d3-b5f6-700b-b299-855ebb144369" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_CostOfRevenue_019c76d3-b5f6-700b-b299-855ebb144369" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019c76d3-b5f6-7c61-a1b6-2aafe5622772" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_GrossProfit_019c76d3-b5f6-7c61-a1b6-2aafe5622772" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_019c76d3-b5f6-7d5d-8960-d05e156a405b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_OperatingExpensesAbstract_019c76d3-b5f6-7d5d-8960-d05e156a405b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_019c76d3-b5f6-739a-bf10-1f0de2f2e9f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c76d3-b5f6-7d5d-8960-d05e156a405b" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_019c76d3-b5f6-739a-bf10-1f0de2f2e9f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_019c76d3-b5f6-7aec-84b5-9e5ce3d4368c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c76d3-b5f6-7d5d-8960-d05e156a405b" xlink:to="loc_us-gaap_SellingAndMarketingExpense_019c76d3-b5f6-7aec-84b5-9e5ce3d4368c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019c76d3-b5f6-78c8-881c-0c05bd1a4075" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c76d3-b5f6-7d5d-8960-d05e156a405b" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019c76d3-b5f6-78c8-881c-0c05bd1a4075" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019c76d3-b5f6-708c-96d1-d126a19a09ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019c76d3-b5f6-7d5d-8960-d05e156a405b" xlink:to="loc_us-gaap_OperatingExpenses_019c76d3-b5f6-708c-96d1-d126a19a09ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019c76d3-b5f6-7c7d-92e0-5cc3d4678b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_OperatingIncomeLoss_019c76d3-b5f6-7c7d-92e0-5cc3d4678b0d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019c76d3-b5f6-7359-b317-110a24e66e85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNonoperatingNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_InterestIncomeExpenseNonoperatingNet_019c76d3-b5f6-7359-b317-110a24e66e85" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019c76d3-b5f6-7d3e-b70d-860ba802869e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019c76d3-b5f6-7d3e-b70d-860ba802869e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c76d3-b5f6-72e8-8249-c7a987a115c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c76d3-b5f6-72e8-8249-c7a987a115c5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019c76d3-b5f6-73d0-a460-a852ec989d5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019c76d3-b5f6-73d0-a460-a852ec989d5f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-7874-8794-23449d676ead" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-7874-8794-23449d676ead" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019c76d3-b5f6-7b6a-9e38-c3ce2ba0ce48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_EarningsPerShareBasic_019c76d3-b5f6-7b6a-9e38-c3ce2ba0ce48" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019c76d3-b5f6-71f6-944d-639c126dee2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019c76d3-b5f6-71f6-944d-639c126dee2a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c76d3-b5f6-77c4-89d5-532ff87c4631" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c76d3-b5f6-77c4-89d5-532ff87c4631" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c76d3-b5f6-7f3d-bb07-d56de4ad3393" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7320-857d-4d9c77fdad01" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c76d3-b5f6-7f3d-bb07-d56de4ad3393" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSHARESANDSHAREHOLDERSDEFICIT" xlink:type="simple" xlink:href="rskd-20251231.xsd#CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSHARESANDSHAREHOLDERSDEFICIT"/>
  <link:definitionLink xlink:role="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSHARESANDSHAREHOLDERSDEFICIT" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c76d3-b5f6-793a-a806-dab86cfaaff6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c76d3-b5f6-754b-b8ba-64693254f8a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-793a-a806-dab86cfaaff6" xlink:to="loc_us-gaap_StatementTable_019c76d3-b5f6-754b-b8ba-64693254f8a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7105-a5dd-7cba1dd64f0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f6-754b-b8ba-64693254f8a8" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7105-a5dd-7cba1dd64f0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-7105-a5dd-7cba1dd64f0c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7105-a5dd-7cba1dd64f0c" xlink:to="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-7105-a5dd-7cba1dd64f0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-76bd-8d05-1c83d86e27c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7105-a5dd-7cba1dd64f0c" xlink:to="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-76bd-8d05-1c83d86e27c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019c76d3-b5f6-751f-99ba-eeb2c7c80cad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-76bd-8d05-1c83d86e27c5" xlink:to="loc_us-gaap_CommonStockMember_019c76d3-b5f6-751f-99ba-eeb2c7c80cad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019c76d3-b5f6-75a9-b694-036166d68478" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-76bd-8d05-1c83d86e27c5" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019c76d3-b5f6-75a9-b694-036166d68478" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019c76d3-b5f6-7708-9d5e-d016ee8f7a53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-76bd-8d05-1c83d86e27c5" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019c76d3-b5f6-7708-9d5e-d016ee8f7a53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c76d3-b5f6-797b-a5b0-eae3a454a7ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-76bd-8d05-1c83d86e27c5" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019c76d3-b5f6-797b-a5b0-eae3a454a7ae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019c76d3-b5f6-719d-88a5-9d4c8f8acd24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-76bd-8d05-1c83d86e27c5" xlink:to="loc_us-gaap_RetainedEarningsMember_019c76d3-b5f6-719d-88a5-9d4c8f8acd24" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7613-90a6-bd7928e115af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f6-754b-b8ba-64693254f8a8" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7613-90a6-bd7928e115af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7613-90a6-bd7928e115af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7613-90a6-bd7928e115af" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7613-90a6-bd7928e115af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7a23-9d29-a8042a12fa92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7613-90a6-bd7928e115af" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7a23-9d29-a8042a12fa92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_019c76d3-b5f6-78f2-abd7-12e3ea913907" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7a23-9d29-a8042a12fa92" xlink:to="loc_us-gaap_IPOMember_019c76d3-b5f6-78f2-abd7-12e3ea913907" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7332-b38d-8fd76c8643dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f6-754b-b8ba-64693254f8a8" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7332-b38d-8fd76c8643dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7332-b38d-8fd76c8643dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7332-b38d-8fd76c8643dc" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7332-b38d-8fd76c8643dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7efa-b1bc-82c1b3bf7e66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7332-b38d-8fd76c8643dc" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7efa-b1bc-82c1b3bf7e66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_SeriesE1ConvertiblePreferredStockMember_019c76d3-b5f6-7f71-8151-cae7e17351c4" xlink:href="rskd-20251231.xsd#rskd_SeriesE1ConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7efa-b1bc-82c1b3bf7e66" xlink:to="loc_rskd_SeriesE1ConvertiblePreferredStockMember_019c76d3-b5f6-7f71-8151-cae7e17351c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-7f38-bcaa-24168cf297bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7efa-b1bc-82c1b3bf7e66" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-7f38-bcaa-24168cf297bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-7615-bd54-1ce80dadec03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7efa-b1bc-82c1b3bf7e66" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-7615-bd54-1ce80dadec03" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_SeriesEConvertiblePreferredStockMember_019c76d3-b5f6-776a-ac87-3f7a17306774" xlink:href="rskd-20251231.xsd#rskd_SeriesEConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7efa-b1bc-82c1b3bf7e66" xlink:to="loc_rskd_SeriesEConvertiblePreferredStockMember_019c76d3-b5f6-776a-ac87-3f7a17306774" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-793a-a806-dab86cfaaff6" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_019c76d3-b5f6-71a0-87f7-01c43196e4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_019c76d3-b5f6-71a0-87f7-01c43196e4f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019c76d3-b5f6-7ab3-815b-f68d4e144c09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019c76d3-b5f6-7ab3-815b-f68d4e144c09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_019c76d3-b5f6-74f0-b4c4-0026b73b8053" xlink:href="rskd-20251231.xsd#rskd_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:to="loc_rskd_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_019c76d3-b5f6-74f0-b4c4-0026b73b8053" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_019c76d3-b5f6-74b2-b7b0-e0c9888f88a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:to="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_019c76d3-b5f6-74b2-b7b0-e0c9888f88a4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_TemporaryEquityAdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrants_019c76d3-b5f6-7f58-a09d-b4463fef33b5" xlink:href="rskd-20251231.xsd#rskd_TemporaryEquityAdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:to="loc_rskd_TemporaryEquityAdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrants_019c76d3-b5f6-7f58-a09d-b4463fef33b5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019c76d3-b5f6-7061-b985-50729d96719b" xlink:href="rskd-20251231.xsd#rskd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:to="loc_rskd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019c76d3-b5f6-7061-b985-50729d96719b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019c76d3-b5f6-7b5d-aba2-a6d50d839ed6" xlink:href="rskd-20251231.xsd#rskd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_019c76d3-b5f6-7da5-9dfe-eeae5b170688" xlink:to="loc_rskd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019c76d3-b5f6-7b5d-aba2-a6d50d839ed6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_019c76d3-b5f6-7d32-943d-730c4f619af1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_019c76d3-b5f6-73d6-9b99-4743eb865476" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-793a-a806-dab86cfaaff6" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c76d3-b5f6-7ab1-a992-0c82cb20649e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019c76d3-b5f6-7ab1-a992-0c82cb20649e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c76d3-b5f6-7102-9fa9-b9d6d10f0d07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockholdersEquity_019c76d3-b5f6-7102-9fa9-b9d6d10f0d07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019c76d3-b5f6-7cdf-b7c9-4c8086e59d4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019c76d3-b5f6-7cdf-b7c9-4c8086e59d4f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019c76d3-b5f6-7013-8a3f-eeae08c9b551" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019c76d3-b5f6-7013-8a3f-eeae08c9b551" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrants_019c76d3-b5f6-7356-a823-2805709333d3" xlink:href="rskd-20251231.xsd#rskd_AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_rskd_AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrants_019c76d3-b5f6-7356-a823-2805709333d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019c76d3-b5f6-7a0b-b64d-af9c41544481" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_019c76d3-b5f6-7a0b-b64d-af9c41544481" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019c76d3-b5f6-76d7-87d3-0fd6bbb072ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019c76d3-b5f6-76d7-87d3-0fd6bbb072ec" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_AdjustmentsToAdditionalPaidInCapitalEliminationOfParValueUponRecapitalization_019c76d3-b5f6-7726-83d3-06ec899b9f15" xlink:href="rskd-20251231.xsd#rskd_AdjustmentsToAdditionalPaidInCapitalEliminationOfParValueUponRecapitalization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_rskd_AdjustmentsToAdditionalPaidInCapitalEliminationOfParValueUponRecapitalization_019c76d3-b5f6-7726-83d3-06ec899b9f15" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_StockIssuedDuringPeriodSharesRecapitalization_019c76d3-b5f6-7a25-9988-31bf2e1ccd15" xlink:href="rskd-20251231.xsd#rskd_StockIssuedDuringPeriodSharesRecapitalization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_rskd_StockIssuedDuringPeriodSharesRecapitalization_019c76d3-b5f6-7a25-9988-31bf2e1ccd15" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019c76d3-b5f6-79d6-aa44-587cf9a5c2b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019c76d3-b5f6-79d6-aa44-587cf9a5c2b1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019c76d3-b5f6-7e50-93cf-21c0c8f61699" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_019c76d3-b5f6-7e50-93cf-21c0c8f61699" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019c76d3-b5f6-7797-a036-033dcf424e23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_019c76d3-b5f6-7797-a036-033dcf424e23" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_StockIssuedDuringPeriodSharesWarrantsExercised_019c76d3-b5f6-7814-8a3e-b7bdb6e76892" xlink:href="rskd-20251231.xsd#rskd_StockIssuedDuringPeriodSharesWarrantsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_rskd_StockIssuedDuringPeriodSharesWarrantsExercised_019c76d3-b5f6-7814-8a3e-b7bdb6e76892" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019ca0a9-a6c0-7b97-aa7e-bc5f931c8389" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019ca0a9-a6c0-7b97-aa7e-bc5f931c8389" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019ca0ae-94c6-7191-aadf-03e2eaf24ebd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_019ca0ae-94c6-7191-aadf-03e2eaf24ebd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019c76d3-b5f6-79cb-9a08-bb0029b9eca1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019c76d3-b5f6-79cb-9a08-bb0029b9eca1" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c76d3-b5f6-70f7-8268-c06c2b90c7fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c76d3-b5f6-70f7-8268-c06c2b90c7fe" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_019c76d3-b5f6-7886-b5a4-87a7007513db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfUnits_019c76d3-b5f6-7886-b5a4-87a7007513db" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c76d3-b5f6-79ba-8f2e-6d0e57f3d7cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019c76d3-b5f6-79ba-8f2e-6d0e57f3d7cc" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_019c76d3-b5f6-734f-9e03-8e9961ae8560" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued_019c76d3-b5f6-734f-9e03-8e9961ae8560" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c76d3-b5f6-7d23-a04a-ae59d53f0c17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019c76d3-b5f6-7d23-a04a-ae59d53f0c17" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-73eb-820f-f3fe85753f28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019c76d3-b5f6-751e-9267-d1f0c74fb6bd" xlink:to="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-73eb-820f-f3fe85753f28" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019c76d3-b5f6-73ff-8247-6a3b810f9bad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c76d3-b5f6-7b4b-a2f7-d59634ef9413" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSHARESANDSHAREHOLDERSDEFICITParenthetical" xlink:type="simple" xlink:href="rskd-20251231.xsd#CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSHARESANDSHAREHOLDERSDEFICITParenthetical"/>
  <link:definitionLink xlink:role="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFCONVERTIBLEPREFERREDSHARESANDSHAREHOLDERSDEFICITParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c76d3-b5f6-707c-901c-a1e863e32a57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c76d3-b5f6-79ee-a5d9-4999e532cfc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-707c-901c-a1e863e32a57" xlink:to="loc_us-gaap_StatementTable_019c76d3-b5f6-79ee-a5d9-4999e532cfc1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-74c1-a1bf-43957600be74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f6-79ee-a5d9-4999e532cfc1" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-74c1-a1bf-43957600be74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-74c1-a1bf-43957600be74_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-74c1-a1bf-43957600be74" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-74c1-a1bf-43957600be74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-73fe-9efe-c125dc7533f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-74c1-a1bf-43957600be74" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-73fe-9efe-c125dc7533f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_SeriesEConvertiblePreferredStockMember_019c76d3-b5f6-73b1-8d9b-97ee5b27480a" xlink:href="rskd-20251231.xsd#rskd_SeriesEConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-73fe-9efe-c125dc7533f5" xlink:to="loc_rskd_SeriesEConvertiblePreferredStockMember_019c76d3-b5f6-73b1-8d9b-97ee5b27480a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_PaymentsOfTemporaryEquityIssuanceCosts_019c76d3-b5f6-7fa6-8820-e2db1c45dc47" xlink:href="rskd-20251231.xsd#rskd_PaymentsOfTemporaryEquityIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-707c-901c-a1e863e32a57" xlink:to="loc_rskd_PaymentsOfTemporaryEquityIssuanceCosts_019c76d3-b5f6-7fa6-8820-e2db1c45dc47" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="rskd-20251231.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:definitionLink xlink:role="http://riskified.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019c76d3-b5f6-779f-99f6-115a30f2af57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_StatementTable_019c76d3-b5f6-779f-99f6-115a30f2af57" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-7002-a9f5-769f26f9769a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019c76d3-b5f6-779f-99f6-115a30f2af57" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-7002-a9f5-769f26f9769a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7002-a9f5-769f26f9769a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-7002-a9f5-769f26f9769a" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7002-a9f5-769f26f9769a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7e69-bb4c-b5589e367c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-7002-a9f5-769f26f9769a" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7e69-bb4c-b5589e367c3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ConvertiblePreferredShareTrancheRightsMember_019c76d3-b5f6-7d78-bd21-2e7bdb7db327" xlink:href="rskd-20251231.xsd#rskd_ConvertiblePreferredShareTrancheRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7e69-bb4c-b5589e367c3e" xlink:to="loc_rskd_ConvertiblePreferredShareTrancheRightsMember_019c76d3-b5f6-7d78-bd21-2e7bdb7db327" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-75ed-9cd5-e0ec497ce847" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-75ed-9cd5-e0ec497ce847" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-7064-932e-ae6ba7bc136b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-75ed-9cd5-e0ec497ce847" xlink:to="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-7064-932e-ae6ba7bc136b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-75ed-9cd5-e0ec497ce847" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_019c76d3-b5f6-7107-9bf4-366eaa74dd81" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_019c76d3-b5f6-7107-9bf4-366eaa74dd81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_019c76d3-b5f6-7b39-8c5e-03edb92c1a01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_019c76d3-b5f6-7b39-8c5e-03edb92c1a01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_019c76d3-b5f6-75df-abe6-44a6ec9c728d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_019c76d3-b5f6-75df-abe6-44a6ec9c728d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_019c76d3-b5f6-7a56-9ba8-9b80e0c0745c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_019c76d3-b5f6-7a56-9ba8-9b80e0c0745c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_019c76d3-b5f6-7401-aff4-8254ed59a878" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_019c76d3-b5f6-7401-aff4-8254ed59a878" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostImpairmentLoss_019c76d3-b5f6-7ce8-b4ef-320572f206df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_CapitalizedContractCostImpairmentLoss_019c76d3-b5f6-7ce8-b4ef-320572f206df" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019c76d3-b5f6-737e-90d0-aa380347de1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_ShareBasedCompensation_019c76d3-b5f6-737e-90d0-aa380347de1f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019c76d3-b5f6-7a0f-a8c5-4d48b0a42bef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAssetAmortizationExpense_019c76d3-b5f6-7a0f-a8c5-4d48b0a42bef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeDepositWithFinancialInstitutionIncreaseDecrease_019c76d3-b5f6-7bc7-b8cf-1eacf397d019" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeDepositWithFinancialInstitutionIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_InterestIncomeDepositWithFinancialInstitutionIncreaseDecrease_019c76d3-b5f6-7bc7-b8cf-1eacf397d019" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ProceedsFromIssuanceOfWarrantsOperatingActivities_019c76d3-b5f6-7ee3-91f0-2418419a0e85" xlink:href="rskd-20251231.xsd#rskd_ProceedsFromIssuanceOfWarrantsOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_rskd_ProceedsFromIssuanceOfWarrantsOperatingActivities_019c76d3-b5f6-7ee3-91f0-2418419a0e85" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_019c76d3-b5f6-78a8-a305-970b1a2077aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-7257-b3a5-6b071040fa6b" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_019c76d3-b5f6-78a8-a305-970b1a2077aa" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-75ed-9cd5-e0ec497ce847" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019c76d3-b5f6-77a9-9904-66075815f7d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_019c76d3-b5f6-77a9-9904-66075815f7d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_IncreaseDecreaseInCapitalizedContractCost_019c76d3-b5f6-7f1b-8203-0a9b08adcc21" xlink:href="rskd-20251231.xsd#rskd_IncreaseDecreaseInCapitalizedContractCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_rskd_IncreaseDecreaseInCapitalizedContractCost_019c76d3-b5f6-7f1b-8203-0a9b08adcc21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019c76d3-b5f6-74f6-92df-f81a8d11eeed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019c76d3-b5f6-74f6-92df-f81a8d11eeed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019c76d3-b5f6-78d5-beb9-3cec1fb31de9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019c76d3-b5f6-78d5-beb9-3cec1fb31de9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_019c76d3-b5f6-7247-aaf9-20958b2003ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities_019c76d3-b5f6-7247-aaf9-20958b2003ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_IncreaseDecreaseInGuarantorObligations_019c76d3-b5f6-7df5-bc9f-1a2e8aa6aaf1" xlink:href="rskd-20251231.xsd#rskd_IncreaseDecreaseInGuarantorObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_rskd_IncreaseDecreaseInGuarantorObligations_019c76d3-b5f6-7df5-bc9f-1a2e8aa6aaf1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_IncreaseDecreaseInProvisionForChargebacks_019c76d3-b5f6-7023-bdb3-5d9927290497" xlink:href="rskd-20251231.xsd#rskd_IncreaseDecreaseInProvisionForChargebacks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_rskd_IncreaseDecreaseInProvisionForChargebacks_019c76d3-b5f6-7023-bdb3-5d9927290497" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_019c76d3-b5f6-7a44-9275-e0e35217030c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingLeaseLiability_019c76d3-b5f6-7a44-9275-e0e35217030c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_019c76d3-b5f6-70ad-a532-eb31079cbd8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019c76d3-b5f6-7c0a-ad69-c15dbdb43f5f" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities_019c76d3-b5f6-70ad-a532-eb31079cbd8d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019c76d3-b5f6-7b8c-991d-eebb8327b949" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_019c76d3-b5f6-75ed-9cd5-e0ec497ce847" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019c76d3-b5f6-7b8c-991d-eebb8327b949" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019c76d3-b5f6-7507-bd8f-20544ecbbabf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_PaymentsToAcquireShortTermInvestments_019c76d3-b5f6-7507-bd8f-20544ecbbabf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_019c76d3-b5f6-73c1-962e-bd97ce6842d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfShorttermInvestments_019c76d3-b5f6-73c1-962e-bd97ce6842d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireInvestments_019c76d3-b5f6-792a-9abd-eacf4ff094b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquireInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_PaymentsToAcquireInvestments_019c76d3-b5f6-792a-9abd-eacf4ff094b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments_019c76d3-b5f6-709d-bab6-e57729ffa261" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments_019c76d3-b5f6-709d-bab6-e57729ffa261" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019c76d3-b5f6-710c-9f6b-cd5c20bb3939" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019c76d3-b5f6-710c-9f6b-cd5c20bb3939" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019c76d3-b5f6-7735-ae33-4deee5449c68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019c76d3-b5f6-7735-ae33-4deee5449c68" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToDevelopSoftware_019c76d3-b5f6-7070-94c0-766439c882a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsToDevelopSoftware"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_PaymentsToDevelopSoftware_019c76d3-b5f6-7070-94c0-766439c882a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019c76d3-b5f6-7444-aba9-83dbed8db0f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_019c76d3-b5f6-7410-ba91-2970f62d1f49" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019c76d3-b5f6-7444-aba9-83dbed8db0f9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c76d3-b5f6-7e0f-9c27-b7d9274d28ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c76d3-b5f6-7e0f-9c27-b7d9274d28ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_019c76d3-b5f6-74c5-a171-6e7adad9921e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c76d3-b5f6-7e0f-9c27-b7d9274d28ed" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_019c76d3-b5f6-74c5-a171-6e7adad9921e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019ca034-e3a4-7890-85da-7db907b4a59d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c76d3-b5f6-7e0f-9c27-b7d9274d28ed" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019ca034-e3a4-7890-85da-7db907b4a59d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c76d3-b5f6-78f1-8f22-b82e2e1ce50e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c76d3-b5f6-7e0f-9c27-b7d9274d28ed" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_019c76d3-b5f6-78f1-8f22-b82e2e1ce50e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019c76d3-b5f6-7bf9-8554-4b0fc9c8b8a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_019c76d3-b5f6-7e0f-9c27-b7d9274d28ed" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019c76d3-b5f6-7bf9-8554-4b0fc9c8b8a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c76d3-b5f6-7e78-ae4c-0b9f8b109d19" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c76d3-b5f6-7e78-ae4c-0b9f8b109d19" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019c76d3-b5f6-7e36-a6f7-1a62eb193c1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019c76d3-b5f6-7e36-a6f7-1a62eb193c1d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c76d3-b5f6-758e-89a8-7a6ef78dcdb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c76d3-b5f6-758e-89a8-7a6ef78dcdb3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c76d3-b5f6-7b6f-81ca-2d6b96ae413c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c76d3-b5f6-7534-96e0-ba67bf835721" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c76d3-b5f6-7534-96e0-ba67bf835721" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019c76d3-b5f6-7dd4-8eae-b78363cad531" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c76d3-b5f6-7534-96e0-ba67bf835721" xlink:to="loc_us-gaap_InterestPaidNet_019c76d3-b5f6-7dd4-8eae-b78363cad531" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaid_019c76d3-b5f6-7752-9c42-154493c9abfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c76d3-b5f6-7534-96e0-ba67bf835721" xlink:to="loc_us-gaap_IncomeTaxesPaid_019c76d3-b5f6-7752-9c42-154493c9abfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRent_019c76d3-b5f6-7cff-98cd-40e313546f64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForRent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c76d3-b5f6-7534-96e0-ba67bf835721" xlink:to="loc_us-gaap_PaymentsForRent_019c76d3-b5f6-7cff-98cd-40e313546f64" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019c76d3-b5f6-7357-a0fc-7901a2a11f89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c76d3-b5f6-7534-96e0-ba67bf835721" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019c76d3-b5f6-7357-a0fc-7901a2a11f89" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_OperatingLeaseRightOfUseAssetLeaseModificationAdjustment_019c76d3-b5f6-74ed-a0a2-6701d49b1383" xlink:href="rskd-20251231.xsd#rskd_OperatingLeaseRightOfUseAssetLeaseModificationAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019c76d3-b5f6-7534-96e0-ba67bf835721" xlink:to="loc_rskd_OperatingLeaseRightOfUseAssetLeaseModificationAdjustment_019c76d3-b5f6-74ed-a0a2-6701d49b1383" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c76d3-b5f6-79c8-bb0e-0d96fdbb8662" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c76d3-b5f6-79c8-bb0e-0d96fdbb8662" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_019c76d3-b5f6-7b30-b54d-88ca520fbce7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c76d3-b5f6-79c8-bb0e-0d96fdbb8662" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_019c76d3-b5f6-7b30-b54d-88ca520fbce7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_019c76d3-b5f6-7728-a7e7-4978746612e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c76d3-b5f6-79c8-bb0e-0d96fdbb8662" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount_019c76d3-b5f6-7728-a7e7-4978746612e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrantsIncludingPortionAttributableToTemporaryEquity_019c76d3-b5f6-799c-b244-3fef983beb0f" xlink:href="rskd-20251231.xsd#rskd_AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrantsIncludingPortionAttributableToTemporaryEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c76d3-b5f6-79c8-bb0e-0d96fdbb8662" xlink:to="loc_rskd_AdjustmentsToAdditionalPaidInCapitalReclassificationOfWarrantsIncludingPortionAttributableToTemporaryEquity_019c76d3-b5f6-799c-b244-3fef983beb0f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_AdjustmentsToAdditionalPaidInCapitalEliminationOfParValueUponRecapitalization_019c76d3-b5f6-778a-ab1b-b38d39969217" xlink:href="rskd-20251231.xsd#rskd_AdjustmentsToAdditionalPaidInCapitalEliminationOfParValueUponRecapitalization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019c76d3-b5f6-79c8-bb0e-0d96fdbb8662" xlink:to="loc_rskd_AdjustmentsToAdditionalPaidInCapitalEliminationOfParValueUponRecapitalization_019c76d3-b5f6-778a-ab1b-b38d39969217" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c76d3-b5f6-70b0-bc1f-b8bdf01af4d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019c76d3-b5f6-7640-9c5c-30e4ad621718" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c76d3-b5f6-70b0-bc1f-b8bdf01af4d2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c76d3-b5f6-70a2-8519-4f29b994bfe5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c76d3-b5f6-70b0-bc1f-b8bdf01af4d2" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019c76d3-b5f6-70a2-8519-4f29b994bfe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCash_019c76d3-b5f6-7cad-8713-fd09ed64ec50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract_019c76d3-b5f6-70b0-bc1f-b8bdf01af4d2" xlink:to="loc_us-gaap_RestrictedCash_019c76d3-b5f6-7cad-8713-fd09ed64ec50" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019c76d3-b5f6-73ce-b39e-9404f8f02243" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b5f6-730a-8e19-74830985d872" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b5f6-730a-8e19-74830985d872" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f6-730a-8e19-74830985d872_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b5f6-730a-8e19-74830985d872" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f6-730a-8e19-74830985d872_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f6-713a-ada8-5ffcee82ef59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b5f6-730a-8e19-74830985d872" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f6-713a-ada8-5ffcee82ef59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b5f6-73d1-9add-2b263270a669" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f6-713a-ada8-5ffcee82ef59" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b5f6-73d1-9add-2b263270a669" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_019c76d3-b5f6-78a3-bda1-a34af7f3a40f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_019c76d3-b5f6-78a3-bda1-a34af7f3a40f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_019c76d3-b5f6-78a3-bda1-a34af7f3a40f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_019c76d3-b5f6-78a3-bda1-a34af7f3a40f" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_019c76d3-b5f6-78a3-bda1-a34af7f3a40f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_019c76d3-b5f6-7476-a413-456714705ce2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_019c76d3-b5f6-78a3-bda1-a34af7f3a40f" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_019c76d3-b5f6-7476-a413-456714705ce2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_CapitalizedSalesCommissionsMember_019c76d3-b5f6-774b-8a74-d027cdc9158e" xlink:href="rskd-20251231.xsd#rskd_CapitalizedSalesCommissionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_019c76d3-b5f6-7476-a413-456714705ce2" xlink:to="loc_rskd_CapitalizedSalesCommissionsMember_019c76d3-b5f6-774b-8a74-d027cdc9158e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_DeferredContractFulfilmentCostsMember_019c76d3-b5f6-7f1c-8104-55b08d788c0a" xlink:href="rskd-20251231.xsd#rskd_DeferredContractFulfilmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_019c76d3-b5f6-7476-a413-456714705ce2" xlink:to="loc_rskd_DeferredContractFulfilmentCostsMember_019c76d3-b5f6-7f1c-8104-55b08d788c0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7f61-b659-d6e279be659d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7f61-b659-d6e279be659d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7f61-b659-d6e279be659d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7f61-b659-d6e279be659d" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7f61-b659-d6e279be659d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7252-baef-27b48659897e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_019c76d3-b5f6-7f61-b659-d6e279be659d" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7252-baef-27b48659897e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_019c76d3-b5f6-7cb5-85a9-e8802332d7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7252-baef-27b48659897e" xlink:to="loc_us-gaap_IPOMember_019c76d3-b5f6-7cb5-85a9-e8802332d7e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OverAllotmentOptionMember_019c76d3-b5f6-74f8-a9fc-d05843b36349" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OverAllotmentOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_019c76d3-b5f6-7252-baef-27b48659897e" xlink:to="loc_us-gaap_OverAllotmentOptionMember_019c76d3-b5f6-74f8-a9fc-d05843b36349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-791d-954b-d617ae7126ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-791d-954b-d617ae7126ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-791d-954b-d617ae7126ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-791d-954b-d617ae7126ad" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-791d-954b-d617ae7126ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7d1e-8daf-1ed8e51b4ff6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-791d-954b-d617ae7126ad" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7d1e-8daf-1ed8e51b4ff6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019c76d3-b5f6-7f16-8334-a8ae91276469" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareAndSoftwareDevelopmentCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7d1e-8daf-1ed8e51b4ff6" xlink:to="loc_us-gaap_SoftwareAndSoftwareDevelopmentCostsMember_019c76d3-b5f6-7f16-8334-a8ae91276469" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c76d3-b5f6-7f9b-9fce-ce60a4cccbe9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c76d3-b5f6-7f9b-9fce-ce60a4cccbe9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c76d3-b5f6-7f9b-9fce-ce60a4cccbe9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c76d3-b5f6-7f9b-9fce-ce60a4cccbe9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c76d3-b5f6-7f9b-9fce-ce60a4cccbe9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c76d3-b5f6-776f-8ca7-139145fa35c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019c76d3-b5f6-7f9b-9fce-ce60a4cccbe9" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c76d3-b5f6-776f-8ca7-139145fa35c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_019c76d3-b5f6-726f-aa85-0427e2ba0c7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c76d3-b5f6-776f-8ca7-139145fa35c3" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_019c76d3-b5f6-726f-aa85-0427e2ba0c7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_CloudComputingArrangementImplementationCostsMember_019c76d3-b5f6-7218-a304-b6dd89ad335e" xlink:href="rskd-20251231.xsd#rskd_CloudComputingArrangementImplementationCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019c76d3-b5f6-776f-8ca7-139145fa35c3" xlink:to="loc_rskd_CloudComputingArrangementImplementationCostsMember_019c76d3-b5f6-7218-a304-b6dd89ad335e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c76d3-b5f6-7a12-a118-427e38016cab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_srt_RangeAxis_019c76d3-b5f6-7a12-a118-427e38016cab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b5f6-7a12-a118-427e38016cab_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c76d3-b5f6-7a12-a118-427e38016cab" xlink:to="loc_srt_RangeMember_019c76d3-b5f6-7a12-a118-427e38016cab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b5f6-74de-a3e3-c83ae1ff7d49" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c76d3-b5f6-7a12-a118-427e38016cab" xlink:to="loc_srt_RangeMember_019c76d3-b5f6-74de-a3e3-c83ae1ff7d49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c76d3-b5f6-7db7-a075-1ca305d87c98" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b5f6-74de-a3e3-c83ae1ff7d49" xlink:to="loc_srt_MinimumMember_019c76d3-b5f6-7db7-a075-1ca305d87c98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c76d3-b5f6-712c-a2b2-0e275e08c9e6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b5f6-74de-a3e3-c83ae1ff7d49" xlink:to="loc_srt_MaximumMember_019c76d3-b5f6-712c-a2b2-0e275e08c9e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7d60-ac1b-55c6d6a7c852" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7d60-ac1b-55c6d6a7c852" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7d60-ac1b-55c6d6a7c852_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7d60-ac1b-55c6d6a7c852" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7d60-ac1b-55c6d6a7c852_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7051-8b68-80f737a6fa83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f6-7d60-ac1b-55c6d6a7c852" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7051-8b68-80f737a6fa83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_SeriesE1ConvertiblePreferredStockMember_019c76d3-b5f6-7ab7-8f60-2f6b305dd2d8" xlink:href="rskd-20251231.xsd#rskd_SeriesE1ConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7051-8b68-80f737a6fa83" xlink:to="loc_rskd_SeriesE1ConvertiblePreferredStockMember_019c76d3-b5f6-7ab7-8f60-2f6b305dd2d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-75eb-b1c9-d7d8d286ea12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7051-8b68-80f737a6fa83" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b5f6-75eb-b1c9-d7d8d286ea12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-766f-89c2-f93bb5501c3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f6-7051-8b68-80f737a6fa83" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b5f6-766f-89c2-f93bb5501c3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_019c76d3-b5f6-7b9f-8a7c-68ece262c84f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_VestingAxis_019c76d3-b5f6-7b9f-8a7c-68ece262c84f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019c76d3-b5f6-7b9f-8a7c-68ece262c84f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_019c76d3-b5f6-7b9f-8a7c-68ece262c84f" xlink:to="loc_us-gaap_VestingDomain_019c76d3-b5f6-7b9f-8a7c-68ece262c84f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019c76d3-b5f6-7054-ba65-18fcf60e6128" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_019c76d3-b5f6-7b9f-8a7c-68ece262c84f" xlink:to="loc_us-gaap_VestingDomain_019c76d3-b5f6-7054-ba65-18fcf60e6128" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019c76d3-b5f6-77c8-bc14-043030b91aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_019c76d3-b5f6-7054-ba65-18fcf60e6128" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_019c76d3-b5f6-77c8-bc14-043030b91aa6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019c76d3-b5f6-7201-9137-47d197d0bf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_019c76d3-b5f6-7054-ba65-18fcf60e6128" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019c76d3-b5f6-7201-9137-47d197d0bf1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-78e5-9b02-5a761dc0c25e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_019c76d3-b5f6-77a8-a84e-4e2756e6475e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-78e5-9b02-5a761dc0c25e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-78e5-9b02-5a761dc0c25e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-78e5-9b02-5a761dc0c25e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-78e5-9b02-5a761dc0c25e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7a44-b176-acc3cafa71e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f6-78e5-9b02-5a761dc0c25e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7a44-b176-acc3cafa71e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_OrdinaryShareWarrantMember_019c76d3-b5f6-75da-b4b4-5bfb4a47034d" xlink:href="rskd-20251231.xsd#rskd_OrdinaryShareWarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f6-7a44-b176-acc3cafa71e1" xlink:to="loc_rskd_OrdinaryShareWarrantMember_019c76d3-b5f6-75da-b4b4-5bfb4a47034d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c76d3-b5f6-7595-8a86-b8753cccd263" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c76d3-b5f6-7595-8a86-b8753cccd263" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019c76d3-b5f6-7a2a-ae62-e5ce0cd49304" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_019c76d3-b5f6-7a2a-ae62-e5ce0cd49304" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c76d3-b5f6-74d9-abd4-9685fcd11bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019c76d3-b5f6-74d9-abd4-9685fcd11bcd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019c76d3-b5f6-7ba0-b927-7e7b19a67adb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019c76d3-b5f6-7ba0-b927-7e7b19a67adb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019c76d3-b5f6-7cea-a6b4-4a6e6794dfa5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019c76d3-b5f6-7cea-a6b4-4a6e6794dfa5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019c76d3-b5f6-7911-8e1b-d2389a9838ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockConsiderationReceivedOnTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_SaleOfStockConsiderationReceivedOnTransaction_019c76d3-b5f6-7911-8e1b-d2389a9838ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_019c76d3-b5f6-73a3-a7b2-5c4591764482" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_019c76d3-b5f6-73a3-a7b2-5c4591764482" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_PaymentsOfOtherStockIssuanceCosts_019c76d3-b5f6-7caf-9db2-de49411175bb" xlink:href="rskd-20251231.xsd#rskd_PaymentsOfOtherStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_PaymentsOfOtherStockIssuanceCosts_019c76d3-b5f6-7caf-9db2-de49411175bb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_CommonStockVotesForEachShare_019c76d3-b5f6-7105-9d22-2590d5d5097f" xlink:href="rskd-20251231.xsd#rskd_CommonStockVotesForEachShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_CommonStockVotesForEachShare_019c76d3-b5f6-7105-9d22-2590d5d5097f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_019c76d3-b5f6-737c-a52d-3d5d3fc93081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityNoteStockSplitConversionRatio1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_StockholdersEquityNoteStockSplitConversionRatio1_019c76d3-b5f6-737c-a52d-3d5d3fc93081" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019c76d3-b5f6-7938-a401-802978e723e1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_019c76d3-b5f6-7073-8b25-09cac5178558" xlink:href="rskd-20251231.xsd#rskd_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_019c76d3-b5f6-7073-8b25-09cac5178558" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019c76d3-b5f6-7e56-a461-686ec93f95b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_019c76d3-b5f6-7e56-a461-686ec93f95b2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_019c76d3-b5f6-7246-94e9-c54d875e5d08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_019c76d3-b5f6-7246-94e9-c54d875e5d08" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_019c76d3-b5f6-7f67-831c-09992ba8528c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivable_019c76d3-b5f6-7f67-831c-09992ba8528c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019c76d3-b5f6-744c-b60b-4f3aaf6109e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019c76d3-b5f6-744c-b60b-4f3aaf6109e8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareGross_019c76d3-b5f6-7802-8287-5c4200e2e932" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedComputerSoftwareGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareGross_019c76d3-b5f6-7802-8287-5c4200e2e932" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019c76d3-b5f6-7ac2-b4bc-0d8564ecbc2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019c76d3-b5f6-7ac2-b4bc-0d8564ecbc2f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019c76d3-b5f6-7de1-b65d-209bf1e93c93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019c76d3-b5f6-7de1-b65d-209bf1e93c93" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuarantorObligationTerm1_019c76d3-b5f6-7df4-b1b9-982f78f79328" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GuarantorObligationTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_GuarantorObligationTerm1_019c76d3-b5f6-7df4-b1b9-982f78f79328" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019c76d3-b5f6-7596-a48a-9641545a536f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_IncreaseDecreaseInContractWithCustomerLiability_019c76d3-b5f6-7596-a48a-9641545a536f" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_RevenueTermOfMerchantContract_019c76d3-b5f6-706d-ab91-79b954362d3e" xlink:href="rskd-20251231.xsd#rskd_RevenueTermOfMerchantContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_RevenueTermOfMerchantContract_019c76d3-b5f6-706d-ab91-79b954362d3e" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortizationPeriod_019c76d3-b5f6-7bf2-a9e4-366b8f653f59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostAmortizationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_CapitalizedContractCostAmortizationPeriod_019c76d3-b5f6-7bf2-a9e4-366b8f653f59" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostImpairmentLoss_019c76d3-b5f6-73c4-a514-edfb7d00cf85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalizedContractCostImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_CapitalizedContractCostImpairmentLoss_019c76d3-b5f6-73c4-a514-edfb7d00cf85" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ChargebackExpense_019c76d3-b5f6-7b29-a7c8-907dfe5ce066" xlink:href="rskd-20251231.xsd#rskd_ChargebackExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_ChargebackExpense_019c76d3-b5f6-7b29-a7c8-907dfe5ce066" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_019c76d3-b5f6-703c-b2bf-fec7aee64166" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_AdvertisingExpense_019c76d3-b5f6-703c-b2bf-fec7aee64166" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019c76d3-b5f6-7277-bcea-de97ae3aecf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019c76d3-b5f6-7277-bcea-de97ae3aecf0" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ClassOfWarrantOrRightVestingPeriod_019c76d3-b5f6-730f-893f-25c4f3e0c491" xlink:href="rskd-20251231.xsd#rskd_ClassOfWarrantOrRightVestingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_ClassOfWarrantOrRightVestingPeriod_019c76d3-b5f6-730f-893f-25c4f3e0c491" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ClassOfWarrantOrRightVestedAndExercisable_019c76d3-b5f6-7d5c-976b-13810335f402" xlink:href="rskd-20251231.xsd#rskd_ClassOfWarrantOrRightVestedAndExercisable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_ClassOfWarrantOrRightVestedAndExercisable_019c76d3-b5f6-7d5c-976b-13810335f402" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019c76d3-b5f6-7c6a-9833-ee36a1cd30e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019c76d3-b5f6-7c6a-9833-ee36a1cd30e9" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ClassOfWarrantOrRightVestingInstallments_019c76d3-b5f6-7637-923c-9df7ef3b2266" xlink:href="rskd-20251231.xsd#rskd_ClassOfWarrantOrRightVestingInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_ClassOfWarrantOrRightVestingInstallments_019c76d3-b5f6-7637-923c-9df7ef3b2266" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ClassOfWarrantOrRightUnrecognizedGrantDateFairValue_019c76d3-b5f6-73ea-bf45-089f04f87d46" xlink:href="rskd-20251231.xsd#rskd_ClassOfWarrantOrRightUnrecognizedGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_rskd_ClassOfWarrantOrRightUnrecognizedGrantDateFairValue_019c76d3-b5f6-73ea-bf45-089f04f87d46" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c76d3-b5f6-71aa-b61c-92e1440a20c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c76d3-b5f6-71aa-b61c-92e1440a20c1" xlink:type="arc" order="32"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_019c76d3-b5f6-76b9-a702-6157b1b73772" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_NumberOfOperatingSegments_019c76d3-b5f6-76b9-a702-6157b1b73772" xlink:type="arc" order="33"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019c76d3-b5f6-71d0-8f72-629e50b8f910" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_NumberOfReportableSegments_019c76d3-b5f6-71d0-8f72-629e50b8f910" xlink:type="arc" order="34"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c76d3-b5f6-76bf-a7bb-be25594bd423" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c76d3-b5f6-76bf-a7bb-be25594bd423" xlink:type="arc" order="35"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019c76d3-b5f6-7fe4-ba18-c020db746f4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_019c76d3-b5f6-79ab-8e37-8853dd030c94" xlink:to="loc_us-gaap_OperatingLeaseLiability_019c76d3-b5f6-7fe4-ba18-c020db746f4f" xlink:type="arc" order="36"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/SummaryofSignificantAccountingPoliciesScheduleofConcentrationRisksDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#SummaryofSignificantAccountingPoliciesScheduleofConcentrationRisksDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/SummaryofSignificantAccountingPoliciesScheduleofConcentrationRisksDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_019c76d3-b5f6-7f7b-a51f-b66abe9911f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_019c76d3-b5f6-769a-a973-97eb737993c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019c76d3-b5f6-7f7b-a51f-b66abe9911f5" xlink:to="loc_us-gaap_ConcentrationRiskTable_019c76d3-b5f6-769a-a973-97eb737993c2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7104-bf1a-01a31e9293e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c76d3-b5f6-769a-a973-97eb737993c2" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7104-bf1a-01a31e9293e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7104-bf1a-01a31e9293e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7104-bf1a-01a31e9293e2" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7104-bf1a-01a31e9293e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7510-9b5b-c131aee02820" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7104-bf1a-01a31e9293e2" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7510-9b5b-c131aee02820" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_019c76d3-b5f6-772f-a81f-424fdbef3a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7510-9b5b-c131aee02820" xlink:to="loc_us-gaap_AccountsReceivableMember_019c76d3-b5f6-772f-a81f-424fdbef3a3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_019c76d3-b5f6-708b-bdcb-9ab6051f9b26" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7510-9b5b-c131aee02820" xlink:to="loc_us-gaap_SalesRevenueNetMember_019c76d3-b5f6-708b-bdcb-9ab6051f9b26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-77b1-9efd-4d578c9ed0d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c76d3-b5f6-769a-a973-97eb737993c2" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-77b1-9efd-4d578c9ed0d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-77b1-9efd-4d578c9ed0d3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-77b1-9efd-4d578c9ed0d3" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-77b1-9efd-4d578c9ed0d3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7d6c-ad54-f1d7869df05a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-77b1-9efd-4d578c9ed0d3" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7d6c-ad54-f1d7869df05a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019c76d3-b5f6-7db9-9cd8-7c15b34666bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7d6c-ad54-f1d7869df05a" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019c76d3-b5f6-7db9-9cd8-7c15b34666bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019c76d3-b5f6-76ba-9a84-1463585c26a5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_019c76d3-b5f6-769a-a973-97eb737993c2" xlink:to="loc_srt_MajorCustomersAxis_019c76d3-b5f6-76ba-9a84-1463585c26a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019c76d3-b5f6-76ba-9a84-1463585c26a5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019c76d3-b5f6-76ba-9a84-1463585c26a5" xlink:to="loc_srt_NameOfMajorCustomerDomain_019c76d3-b5f6-76ba-9a84-1463585c26a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019c76d3-b5f6-7117-999f-9efc0f592bf7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019c76d3-b5f6-76ba-9a84-1463585c26a5" xlink:to="loc_srt_NameOfMajorCustomerDomain_019c76d3-b5f6-7117-999f-9efc0f592bf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_CustomerAMember_019c76d3-b5f6-76a3-9668-cd96b5161066" xlink:href="rskd-20251231.xsd#rskd_CustomerAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019c76d3-b5f6-7117-999f-9efc0f592bf7" xlink:to="loc_rskd_CustomerAMember_019c76d3-b5f6-76a3-9668-cd96b5161066" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_CustomerCMember_019c76d3-b5f6-70a5-9419-09e013bbaf25" xlink:href="rskd-20251231.xsd#rskd_CustomerCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019c76d3-b5f6-7117-999f-9efc0f592bf7" xlink:to="loc_rskd_CustomerCMember_019c76d3-b5f6-70a5-9419-09e013bbaf25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019c76d3-b5f6-7cbe-a96a-f09c7e933c33" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_019c76d3-b5f6-7f7b-a51f-b66abe9911f5" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019c76d3-b5f6-7cbe-a96a-f09c7e933c33" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/SummaryofSignificantAccountingPoliciesScheduleofPropertyandEquipmentDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#SummaryofSignificantAccountingPoliciesScheduleofPropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/SummaryofSignificantAccountingPoliciesScheduleofPropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-75a1-99e8-701b164dbde1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f6-76b5-9c1e-e14f1f6a97e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-75a1-99e8-701b164dbde1" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f6-76b5-9c1e-e14f1f6a97e6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-7782-8ae3-4d0c2921024f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f6-76b5-9c1e-e14f1f6a97e6" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-7782-8ae3-4d0c2921024f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7782-8ae3-4d0c2921024f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-7782-8ae3-4d0c2921024f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7782-8ae3-4d0c2921024f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-70a1-bb34-3dc5e06977ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-7782-8ae3-4d0c2921024f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-70a1-bb34-3dc5e06977ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_019c76d3-b5f6-70e6-8359-c04acb9460ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-70a1-bb34-3dc5e06977ee" xlink:to="loc_us-gaap_ComputerEquipmentMember_019c76d3-b5f6-70e6-8359-c04acb9460ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_FurnitureAndOfficeEquipmentMember_019c76d3-b5f6-76fb-a218-f083bc2dc440" xlink:href="rskd-20251231.xsd#rskd_FurnitureAndOfficeEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-70a1-bb34-3dc5e06977ee" xlink:to="loc_rskd_FurnitureAndOfficeEquipmentMember_019c76d3-b5f6-76fb-a218-f083bc2dc440" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c76d3-b5f6-74ea-9d6f-9c46177c7177" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f6-76b5-9c1e-e14f1f6a97e6" xlink:to="loc_srt_RangeAxis_019c76d3-b5f6-74ea-9d6f-9c46177c7177" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b5f6-74ea-9d6f-9c46177c7177_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c76d3-b5f6-74ea-9d6f-9c46177c7177" xlink:to="loc_srt_RangeMember_019c76d3-b5f6-74ea-9d6f-9c46177c7177_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b5f6-7862-a4a1-feea4e5c3836" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c76d3-b5f6-74ea-9d6f-9c46177c7177" xlink:to="loc_srt_RangeMember_019c76d3-b5f6-7862-a4a1-feea4e5c3836" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c76d3-b5f6-7657-8c2a-f19f7d2c40c8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b5f6-7862-a4a1-feea4e5c3836" xlink:to="loc_srt_MinimumMember_019c76d3-b5f6-7657-8c2a-f19f7d2c40c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c76d3-b5f6-7ea6-a182-c0108ed958eb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b5f6-7862-a4a1-feea4e5c3836" xlink:to="loc_srt_MaximumMember_019c76d3-b5f6-7ea6-a182-c0108ed958eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019c76d3-b5f6-7201-973f-7a729723e08a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-75a1-99e8-701b164dbde1" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019c76d3-b5f6-7201-973f-7a729723e08a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/SegmentInformationDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#SegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/SegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019c76d3-b5f6-7f52-922b-ce1b47666ae6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c76d3-b5f6-7d22-a319-f351959a9877" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c76d3-b5f6-7f52-922b-ce1b47666ae6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c76d3-b5f6-7d22-a319-f351959a9877" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019c76d3-b5f6-7915-836a-9b7fa5d1376a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019c76d3-b5f6-7d22-a319-f351959a9877" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019c76d3-b5f6-7915-836a-9b7fa5d1376a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c76d3-b5f6-7915-836a-9b7fa5d1376a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c76d3-b5f6-7915-836a-9b7fa5d1376a" xlink:to="loc_us-gaap_SegmentDomain_019c76d3-b5f6-7915-836a-9b7fa5d1376a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019c76d3-b5f6-7084-a664-8ecae05a8cd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019c76d3-b5f6-7915-836a-9b7fa5d1376a" xlink:to="loc_us-gaap_SegmentDomain_019c76d3-b5f6-7084-a664-8ecae05a8cd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ReportableSegmentMember_019c76d3-b5f6-7e05-af16-33974962c33e" xlink:href="rskd-20251231.xsd#rskd_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019c76d3-b5f6-7084-a664-8ecae05a8cd7" xlink:to="loc_rskd_ReportableSegmentMember_019c76d3-b5f6-7e05-af16-33974962c33e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c76d3-b5f6-7596-a38e-cfdcccd9d8a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c76d3-b5f6-7f52-922b-ce1b47666ae6" xlink:to="loc_us-gaap_Revenues_019c76d3-b5f6-7596-a38e-cfdcccd9d8a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019c76d3-b5f6-73a0-a9ea-c20569e3e09b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c76d3-b5f6-7f52-922b-ce1b47666ae6" xlink:to="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019c76d3-b5f6-73a0-a9ea-c20569e3e09b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ChargebacksNet_019c76d3-b5f6-75c5-9153-6b1444ad0042" xlink:href="rskd-20251231.xsd#rskd_ChargebacksNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019c76d3-b5f6-73a0-a9ea-c20569e3e09b" xlink:to="loc_rskd_ChargebacksNet_019c76d3-b5f6-75c5-9153-6b1444ad0042" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostOfOperatingRevenue_019c76d3-b5f6-7a5f-a3d6-95aada5478ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostOfOperatingRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019c76d3-b5f6-73a0-a9ea-c20569e3e09b" xlink:to="loc_us-gaap_OtherCostOfOperatingRevenue_019c76d3-b5f6-7a5f-a3d6-95aada5478ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_OperatingExpensesPayrollCosts_019c76d3-b5f6-72b8-9b48-1eba8047e3c2" xlink:href="rskd-20251231.xsd#rskd_OperatingExpensesPayrollCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019c76d3-b5f6-73a0-a9ea-c20569e3e09b" xlink:to="loc_rskd_OperatingExpensesPayrollCosts_019c76d3-b5f6-72b8-9b48-1eba8047e3c2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_OperatingExpensesNonPayrollCosts_019c76d3-b5f6-78e5-ac76-8f28bb86ee3c" xlink:href="rskd-20251231.xsd#rskd_OperatingExpensesNonPayrollCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019c76d3-b5f6-73a0-a9ea-c20569e3e09b" xlink:to="loc_rskd_OperatingExpensesNonPayrollCosts_019c76d3-b5f6-78e5-ac76-8f28bb86ee3c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingOtherItemAmount_019c76d3-b5f6-71bf-bd2c-195c24dcae58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingOtherItemAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationFromSegmentTotalsToConsolidatedAbstract_019c76d3-b5f6-73a0-a9ea-c20569e3e09b" xlink:to="loc_us-gaap_SegmentReportingOtherItemAmount_019c76d3-b5f6-71bf-bd2c-195c24dcae58" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-7186-948d-70b3bb221fc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019c76d3-b5f6-7f52-922b-ce1b47666ae6" xlink:to="loc_us-gaap_NetIncomeLoss_019c76d3-b5f6-7186-948d-70b3bb221fc1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/RevenueRecognitionRevenuebyGeographicAreasDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#RevenueRecognitionRevenuebyGeographicAreasDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/RevenueRecognitionRevenuebyGeographicAreasDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-733b-98d5-cc898c06c7a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7d25-b1fd-7d0a3330c912" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-733b-98d5-cc898c06c7a7" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7d25-b1fd-7d0a3330c912" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c76d3-b5f6-7bf7-b969-82fdd83efc9c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7d25-b1fd-7d0a3330c912" xlink:to="loc_srt_StatementGeographicalAxis_019c76d3-b5f6-7bf7-b969-82fdd83efc9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7bf7-b969-82fdd83efc9c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b5f6-7bf7-b969-82fdd83efc9c" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7bf7-b969-82fdd83efc9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7048-8ce3-e8fe19bc4b49" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b5f6-7bf7-b969-82fdd83efc9c" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7048-8ce3-e8fe19bc4b49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c76d3-b5f6-7db2-8ff6-1b7d5d2cfc58" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7048-8ce3-e8fe19bc4b49" xlink:to="loc_country_US_019c76d3-b5f6-7db2-8ff6-1b7d5d2cfc58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_019c76d3-b5f6-7ef0-a6c2-5536c9b5f4e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7048-8ce3-e8fe19bc4b49" xlink:to="loc_us-gaap_EMEAMember_019c76d3-b5f6-7ef0-a6c2-5536c9b5f4e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_019c76d3-b5f6-79ae-a9e6-8babe8fb5037" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7048-8ce3-e8fe19bc4b49" xlink:to="loc_srt_AsiaPacificMember_019c76d3-b5f6-79ae-a9e6-8babe8fb5037" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_019c76d3-b5f6-7162-84e2-c0f7aeb22d75" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7048-8ce3-e8fe19bc4b49" xlink:to="loc_country_IL_019c76d3-b5f6-7162-84e2-c0f7aeb22d75" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AmericasMember_019c76d3-b5f6-7fe0-a515-3a73610a73e3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AmericasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f6-7048-8ce3-e8fe19bc4b49" xlink:to="loc_srt_AmericasMember_019c76d3-b5f6-7fe0-a515-3a73610a73e3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7861-8f07-9424b3c65b63" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7d25-b1fd-7d0a3330c912" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7861-8f07-9424b3c65b63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7861-8f07-9424b3c65b63_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7861-8f07-9424b3c65b63" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7861-8f07-9424b3c65b63_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7434-824c-2cbe33209dea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7861-8f07-9424b3c65b63" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7434-824c-2cbe33209dea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_019c76d3-b5f6-7b7b-b38e-8565a8648c74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7434-824c-2cbe33209dea" xlink:to="loc_us-gaap_SalesRevenueNetMember_019c76d3-b5f6-7b7b-b38e-8565a8648c74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7844-90bc-4e8c4ca9837c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7d25-b1fd-7d0a3330c912" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7844-90bc-4e8c4ca9837c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7844-90bc-4e8c4ca9837c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7844-90bc-4e8c4ca9837c" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7844-90bc-4e8c4ca9837c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7f3f-8c83-c070d150923c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7844-90bc-4e8c4ca9837c" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7f3f-8c83-c070d150923c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeographicConcentrationRiskMember_019c76d3-b5f6-74dd-aedb-94ba2debb292" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeographicConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7f3f-8c83-c070d150923c" xlink:to="loc_us-gaap_GeographicConcentrationRiskMember_019c76d3-b5f6-74dd-aedb-94ba2debb292" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c76d3-b5f6-73da-a90b-83db638ef7e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-733b-98d5-cc898c06c7a7" xlink:to="loc_us-gaap_Revenues_019c76d3-b5f6-73da-a90b-83db638ef7e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019c76d3-b5f6-7073-9a23-de1bfef47bf2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-733b-98d5-cc898c06c7a7" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019c76d3-b5f6-7073-9a23-de1bfef47bf2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#RevenueRecognitionDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/RevenueRecognitionDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-7dca-b0a8-b33173cfa70e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7361-bb76-536cb6c0e543" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-7dca-b0a8-b33173cfa70e" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7361-bb76-536cb6c0e543" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7484-8d36-2d76d36ea2c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7361-bb76-536cb6c0e543" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7484-8d36-2d76d36ea2c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7484-8d36-2d76d36ea2c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7484-8d36-2d76d36ea2c4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7484-8d36-2d76d36ea2c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7e8e-bdce-b39e55bd5b91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019c76d3-b5f6-7484-8d36-2d76d36ea2c4" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7e8e-bdce-b39e55bd5b91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_019c76d3-b5f6-7c0d-86fe-25fbceb5e97d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019c76d3-b5f6-7e8e-bdce-b39e55bd5b91" xlink:to="loc_us-gaap_SalesRevenueNetMember_019c76d3-b5f6-7c0d-86fe-25fbceb5e97d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7f7f-8b52-18366e8602ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7361-bb76-536cb6c0e543" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7f7f-8b52-18366e8602ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7f7f-8b52-18366e8602ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7f7f-8b52-18366e8602ba" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-7f7f-8b52-18366e8602ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-71c6-9067-e27d13821bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019c76d3-b5f6-7f7f-8b52-18366e8602ba" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-71c6-9067-e27d13821bc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_019c76d3-b5f6-75ce-a5ab-0b9229f7d3ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProductConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019c76d3-b5f6-71c6-9067-e27d13821bc0" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_019c76d3-b5f6-75ce-a5ab-0b9229f7d3ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019c76d3-b5f6-7526-b29b-a04a264c97a9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019c76d3-b5f6-7361-bb76-536cb6c0e543" xlink:to="loc_srt_ProductOrServiceAxis_019c76d3-b5f6-7526-b29b-a04a264c97a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c76d3-b5f6-7526-b29b-a04a264c97a9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019c76d3-b5f6-7526-b29b-a04a264c97a9" xlink:to="loc_srt_ProductsAndServicesDomain_019c76d3-b5f6-7526-b29b-a04a264c97a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019c76d3-b5f6-7983-9f3a-00d9729caa67" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019c76d3-b5f6-7526-b29b-a04a264c97a9" xlink:to="loc_srt_ProductsAndServicesDomain_019c76d3-b5f6-7983-9f3a-00d9729caa67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ReviewServiceRevenueMember_019c76d3-b5f6-7ec1-9ce8-769253f27356" xlink:href="rskd-20251231.xsd#rskd_ReviewServiceRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c76d3-b5f6-7983-9f3a-00d9729caa67" xlink:to="loc_rskd_ReviewServiceRevenueMember_019c76d3-b5f6-7ec1-9ce8-769253f27356" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_IndemnificationServiceRevenueMember_019c76d3-b5f6-7b50-b621-a16b9656d435" xlink:href="rskd-20251231.xsd#rskd_IndemnificationServiceRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019c76d3-b5f6-7983-9f3a-00d9729caa67" xlink:to="loc_rskd_IndemnificationServiceRevenueMember_019c76d3-b5f6-7b50-b621-a16b9656d435" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c76d3-b5f6-76b6-ad22-e508d8cf3aa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-7dca-b0a8-b33173cfa70e" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019c76d3-b5f6-76b6-ad22-e508d8cf3aa4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueNotFromContractWithCustomer_019c76d3-b5f6-751d-bf87-e32ce75789d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueNotFromContractWithCustomer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-7dca-b0a8-b33173cfa70e" xlink:to="loc_us-gaap_RevenueNotFromContractWithCustomer_019c76d3-b5f6-751d-bf87-e32ce75789d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019c76d3-b5f6-79b9-9361-f3794a9dfcb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-7dca-b0a8-b33173cfa70e" xlink:to="loc_us-gaap_Revenues_019c76d3-b5f6-79b9-9361-f3794a9dfcb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019c76d3-b5f6-76fe-a1b8-7a2bf6ae8f79" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019c76d3-b5f6-7dca-b0a8-b33173cfa70e" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019c76d3-b5f6-76fe-a1b8-7a2bf6ae8f79" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/FairValueMeasurementsScheduleofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#FairValueMeasurementsScheduleofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/FairValueMeasurementsScheduleofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-7cbc-85dc-b87fc17b92b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-77ac-83e6-f52e428df901" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-7cbc-85dc-b87fc17b92b7" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-77ac-83e6-f52e428df901" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7587-9eb8-25844af40459" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-77ac-83e6-f52e428df901" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7587-9eb8-25844af40459" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-7587-9eb8-25844af40459_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7587-9eb8-25844af40459" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-7587-9eb8-25844af40459_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-74e5-9a3e-904ca99d725b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7587-9eb8-25844af40459" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-74e5-9a3e-904ca99d725b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ConvertiblePreferredShareTrancheRightsMember_019c76d3-b5f6-7ce8-87a7-9a6cc1ce1245" xlink:href="rskd-20251231.xsd#rskd_ConvertiblePreferredShareTrancheRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-74e5-9a3e-904ca99d725b" xlink:to="loc_rskd_ConvertiblePreferredShareTrancheRightsMember_019c76d3-b5f6-7ce8-87a7-9a6cc1ce1245" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cbe49-842d-72ce-b667-e3bc171ef8d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-77ac-83e6-f52e428df901" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cbe49-842d-72ce-b667-e3bc171ef8d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe49-842d-72ce-b667-e3bc171ef8d9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbe49-842d-72ce-b667-e3bc171ef8d9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe49-842d-72ce-b667-e3bc171ef8d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe49-bced-730d-8bba-71f98f17832f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbe49-842d-72ce-b667-e3bc171ef8d9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe49-bced-730d-8bba-71f98f17832f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_GovernmentBondsMember_019cbe4c-d042-7b3a-9517-a2158255af7f" xlink:href="rskd-20251231.xsd#rskd_GovernmentBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe49-bced-730d-8bba-71f98f17832f" xlink:to="loc_rskd_GovernmentBondsMember_019cbe4c-d042-7b3a-9517-a2158255af7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_019cbe4b-c162-7785-9619-2d158c1c1d7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe49-bced-730d-8bba-71f98f17832f" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_019cbe4b-c162-7785-9619-2d158c1c1d7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c76d3-b5f6-7348-ba45-0b482b3c055e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-77ac-83e6-f52e428df901" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c76d3-b5f6-7348-ba45-0b482b3c055e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c76d3-b5f6-7348-ba45-0b482b3c055e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c76d3-b5f6-7348-ba45-0b482b3c055e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c76d3-b5f6-7348-ba45-0b482b3c055e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c76d3-b5f6-74d6-9809-7b5f831a5d72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019c76d3-b5f6-7348-ba45-0b482b3c055e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c76d3-b5f6-74d6-9809-7b5f831a5d72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019c76d3-b5f6-7470-9328-8e79ad791b9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c76d3-b5f6-74d6-9809-7b5f831a5d72" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019c76d3-b5f6-7470-9328-8e79ad791b9f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019c76d3-b5f6-76f7-ada4-b02eccc00acc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c76d3-b5f6-74d6-9809-7b5f831a5d72" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019c76d3-b5f6-76f7-ada4-b02eccc00acc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019c76d3-b5f6-7a40-9b2f-72072e7730cd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019c76d3-b5f6-74d6-9809-7b5f831a5d72" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019c76d3-b5f6-7a40-9b2f-72072e7730cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c76d3-b5f6-7492-93ed-6de1199b81a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-7cbc-85dc-b87fc17b92b7" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c76d3-b5f6-7492-93ed-6de1199b81a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019c76d3-b5f6-7493-8bad-037e22d8a6ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c76d3-b5f6-7492-93ed-6de1199b81a2" xlink:to="loc_us-gaap_ShortTermInvestments_019c76d3-b5f6-7493-8bad-037e22d8a6ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019cc0c7-9489-7261-b21f-6be8d3fd13ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c76d3-b5f6-7492-93ed-6de1199b81a2" xlink:to="loc_us-gaap_DerivativeAssets_019cc0c7-9489-7261-b21f-6be8d3fd13ca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019cc0c7-9489-71de-82e8-d3b38a91e823" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c76d3-b5f6-7492-93ed-6de1199b81a2" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019cc0c7-9489-71de-82e8-d3b38a91e823" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019c76d3-b5f6-7c3a-86b2-473837b1d8ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_019c76d3-b5f6-7492-93ed-6de1199b81a2" xlink:to="loc_us-gaap_DerivativeAssetStatementOfFinancialPositionExtensibleEnumeration_019c76d3-b5f6-7c3a-86b2-473837b1d8ca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c76d3-b5f6-785c-8a7f-f8a1fa24998d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-7cbc-85dc-b87fc17b92b7" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c76d3-b5f6-785c-8a7f-f8a1fa24998d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019cc0f5-f21d-72ff-8742-e992ae6eb7f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c76d3-b5f6-785c-8a7f-f8a1fa24998d" xlink:to="loc_us-gaap_DerivativeLiabilities_019cc0f5-f21d-72ff-8742-e992ae6eb7f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019cc0f6-9fa1-7b9c-bd62-7afc656d5b46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c76d3-b5f6-785c-8a7f-f8a1fa24998d" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019cc0f6-9fa1-7b9c-bd62-7afc656d5b46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019c76d3-b5f6-74df-949e-dabeb4393ffb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_019c76d3-b5f6-785c-8a7f-f8a1fa24998d" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_019c76d3-b5f6-74df-949e-dabeb4393ffb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/FairValueMeasurementsScheduleofShorttermInvestmentsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#FairValueMeasurementsScheduleofShorttermInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/FairValueMeasurementsScheduleofShorttermInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-736e-bbc8-a04b31c625c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-7bda-a16f-948860f843eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-736e-bbc8-a04b31c625c4" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-7bda-a16f-948860f843eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_019c76d3-b5f6-77c2-8182-bb783117a2d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-7bda-a16f-948860f843eb" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_019c76d3-b5f6-77c2-8182-bb783117a2d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019c76d3-b5f6-77c2-8182-bb783117a2d7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019c76d3-b5f6-77c2-8182-bb783117a2d7" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019c76d3-b5f6-77c2-8182-bb783117a2d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019c76d3-b5f6-767f-a988-58767efbab0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_019c76d3-b5f6-77c2-8182-bb783117a2d7" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019c76d3-b5f6-767f-a988-58767efbab0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentDebtSecuritiesMember_019c76d3-b5f6-76be-be44-4ad92915b0ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_019c76d3-b5f6-767f-a988-58767efbab0d" xlink:to="loc_us-gaap_USGovernmentDebtSecuritiesMember_019c76d3-b5f6-76be-be44-4ad92915b0ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cbe4f-9ca1-74a1-863f-73a284c41d6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019c76d3-b5f6-7bda-a16f-948860f843eb" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cbe4f-9ca1-74a1-863f-73a284c41d6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe4f-9ca1-74a1-863f-73a284c41d6d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbe4f-9ca1-74a1-863f-73a284c41d6d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe4f-9ca1-74a1-863f-73a284c41d6d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe4f-c0e4-70c6-80b4-bd1232689360" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cbe4f-9ca1-74a1-863f-73a284c41d6d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe4f-c0e4-70c6-80b4-bd1232689360" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_GovernmentBondsMember_019cbe4f-e1e9-7857-8cba-b90f340fddc4" xlink:href="rskd-20251231.xsd#rskd_GovernmentBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe4f-c0e4-70c6-80b4-bd1232689360" xlink:to="loc_rskd_GovernmentBondsMember_019cbe4f-e1e9-7857-8cba-b90f340fddc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_019cbe50-0bb6-7baa-8e01-d8a0d3427482" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cbe4f-c0e4-70c6-80b4-bd1232689360" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_019cbe50-0bb6-7baa-8e01-d8a0d3427482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss_019c76d3-b5f6-7dd7-a672-99fbc18ea3b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-736e-bbc8-a04b31c625c4" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss_019c76d3-b5f6-7dd7-a672-99fbc18ea3b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019c76d3-b5f6-7f00-b325-ec5b368656e1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-736e-bbc8-a04b31c625c4" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019c76d3-b5f6-7f00-b325-ec5b368656e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019c76d3-b5f6-7d7e-88d2-8c659e672e11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-736e-bbc8-a04b31c625c4" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019c76d3-b5f6-7d7e-88d2-8c659e672e11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c76d3-b5f6-7423-8154-7a44aebc353e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019c76d3-b5f6-736e-bbc8-a04b31c625c4" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_019c76d3-b5f6-7423-8154-7a44aebc353e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/DerivativeInstrumentsandHedgingDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#DerivativeInstrumentsandHedgingDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/DerivativeInstrumentsandHedgingDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7bbc-a802-246337f15728" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-7be4-9dc2-9fca1415ae71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7bbc-a802-246337f15728" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-7be4-9dc2-9fca1415ae71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7b7f-90bc-1bea5926ab15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-7be4-9dc2-9fca1415ae71" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7b7f-90bc-1bea5926ab15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-7b7f-90bc-1bea5926ab15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7b7f-90bc-1bea5926ab15" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-7b7f-90bc-1bea5926ab15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-71f4-93a5-f62434e81b93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019c76d3-b5f6-7b7f-90bc-1bea5926ab15" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-71f4-93a5-f62434e81b93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeForwardMember_019c76d3-b5f6-7cf7-bb00-13564b23592c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignExchangeForwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019c76d3-b5f6-71f4-93a5-f62434e81b93" xlink:to="loc_us-gaap_ForeignExchangeForwardMember_019c76d3-b5f6-7cf7-bb00-13564b23592c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-794c-a39d-a278cea39d50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-7be4-9dc2-9fca1415ae71" xlink:to="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-794c-a39d-a278cea39d50" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-794c-a39d-a278cea39d50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-794c-a39d-a278cea39d50" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-794c-a39d-a278cea39d50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7d7d-8994-a4ff75ed287f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-794c-a39d-a278cea39d50" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7d7d-8994-a4ff75ed287f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c76d3-b5f6-7f1c-8f65-dc3cf014c8e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7d7d-8994-a4ff75ed287f" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c76d3-b5f6-7f1c-8f65-dc3cf014c8e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019c76d3-b5f6-7994-a64b-464d9cdc5202" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7d7d-8994-a4ff75ed287f" xlink:to="loc_us-gaap_NondesignatedMember_019c76d3-b5f6-7994-a64b-464d9cdc5202" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019c76d3-b5f6-7de9-a559-b4d8e1a1f568" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7bbc-a802-246337f15728" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019c76d3-b5f6-7de9-a559-b4d8e1a1f568" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/DerivativeInstrumentsandHedgingEffectofForeignCurrencyContractsontheConsolidatedStatementofOperationsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#DerivativeInstrumentsandHedgingEffectofForeignCurrencyContractsontheConsolidatedStatementofOperationsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/DerivativeInstrumentsandHedgingEffectofForeignCurrencyContractsontheConsolidatedStatementofOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7ae2-8606-9ee98244983d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-707d-93c9-81a7808f11bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7ae2-8606-9ee98244983d" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-707d-93c9-81a7808f11bf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-7b24-82d7-633701ec90b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-707d-93c9-81a7808f11bf" xlink:to="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-7b24-82d7-633701ec90b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7b24-82d7-633701ec90b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-7b24-82d7-633701ec90b1" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7b24-82d7-633701ec90b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7dfa-bd29-97c53abb099c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019c76d3-b5f6-7b24-82d7-633701ec90b1" xlink:to="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7dfa-bd29-97c53abb099c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c76d3-b5f6-74e7-a264-f925bd118dc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7dfa-bd29-97c53abb099c" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019c76d3-b5f6-74e7-a264-f925bd118dc4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019c76d3-b5f6-7a03-bc0b-f92607823f0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019c76d3-b5f6-7dfa-bd29-97c53abb099c" xlink:to="loc_us-gaap_NondesignatedMember_019c76d3-b5f6-7a03-bc0b-f92607823f0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b5f6-756c-b96c-9eaf8dca4e59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-707d-93c9-81a7808f11bf" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b5f6-756c-b96c-9eaf8dca4e59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-756c-b96c-9eaf8dca4e59_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b5f6-756c-b96c-9eaf8dca4e59" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-756c-b96c-9eaf8dca4e59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b5f6-756c-b96c-9eaf8dca4e59" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesMember_019c76d3-b5f6-7442-a422-007d0df99687" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:to="loc_us-gaap_SalesMember_019c76d3-b5f6-7442-a422-007d0df99687" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019c76d3-b5f6-7e03-b8e5-c300396787eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:to="loc_us-gaap_CostOfSalesMember_019c76d3-b5f6-7e03-b8e5-c300396787eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019c76d3-b5f6-7d6d-8003-5a17a2521df1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019c76d3-b5f6-7d6d-8003-5a17a2521df1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_019c76d3-b5f6-76bf-b7a7-5afdaddaeb50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_019c76d3-b5f6-76bf-b7a7-5afdaddaeb50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019c76d3-b5f6-776d-a7ee-aabab7855e8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019c76d3-b5f6-776d-a7ee-aabab7855e8e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_019c76d3-b5f6-7700-8b08-8a648cd82175" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNonoperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b5f6-78a1-a27c-8a132a7f8ea5" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_019c76d3-b5f6-7700-8b08-8a648cd82175" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c76d3-b5f6-7d32-9709-7048bf0ea385" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7ae2-8606-9ee98244983d" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019c76d3-b5f6-7d32-9709-7048bf0ea385" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/DerivativeInstrumentsandHedgingEffectofForeignCurrencyContractsonAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#DerivativeInstrumentsandHedgingEffectofForeignCurrencyContractsonAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/DerivativeInstrumentsandHedgingEffectofForeignCurrencyContractsonAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7b6d-87e0-11b1c0be5fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-7b51-88aa-8af89cd9e142" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7b6d-87e0-11b1c0be5fdf" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-7b51-88aa-8af89cd9e142" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7e62-865e-aa069b15487a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019c76d3-b5f6-7b51-88aa-8af89cd9e142" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7e62-865e-aa069b15487a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-7e62-865e-aa069b15487a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7e62-865e-aa069b15487a" xlink:to="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-7e62-865e-aa069b15487a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-70a1-bff5-98bdb4b81eb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f6-7e62-865e-aa069b15487a" xlink:to="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-70a1-bff5-98bdb4b81eb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c76d3-b5f6-7cc5-af9c-f431c839396b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c76d3-b5f6-70a1-bff5-98bdb4b81eb5" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_019c76d3-b5f6-7cc5-af9c-f431c839396b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeRollForward_019c76d3-b5f6-792c-9261-e4afacb6d63d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TranslationAdjustmentForNetInvestmentHedgeRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019c76d3-b5f6-7b6d-87e0-11b1c0be5fdf" xlink:to="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeRollForward_019c76d3-b5f6-792c-9261-e4afacb6d63d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c76d3-b5f6-7856-97d8-0e5c1d5f99eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeRollForward_019c76d3-b5f6-792c-9261-e4afacb6d63d" xlink:to="loc_us-gaap_StockholdersEquity_019c76d3-b5f6-7856-97d8-0e5c1d5f99eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019c76d3-b5f6-7f53-9869-a0f119bcdc35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeRollForward_019c76d3-b5f6-792c-9261-e4afacb6d63d" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_019c76d3-b5f6-7f53-9869-a0f119bcdc35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019ca0a1-de60-7c11-838a-8b9e1fe9d931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeRollForward_019c76d3-b5f6-792c-9261-e4afacb6d63d" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_019ca0a1-de60-7c11-838a-8b9e1fe9d931" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019c76d3-b5f6-71b5-bc81-b21fe1d70481" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TranslationAdjustmentForNetInvestmentHedgeRollForward_019c76d3-b5f6-792c-9261-e4afacb6d63d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019c76d3-b5f6-71b5-bc81-b21fe1d70481" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019c76d3-b5f6-7fbe-a20b-1c1cf2d309e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/ConsolidatedBalanceSheetComponentsPropertyandEquipmentNetDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#ConsolidatedBalanceSheetComponentsPropertyandEquipmentNetDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/ConsolidatedBalanceSheetComponentsPropertyandEquipmentNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-78df-9502-5593639846a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f6-7bb4-ac4d-8f9ecb3cee95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-78df-9502-5593639846a3" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f6-7bb4-ac4d-8f9ecb3cee95" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-761e-b707-e8070f731fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f6-7bb4-ac4d-8f9ecb3cee95" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-761e-b707-e8070f731fb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-761e-b707-e8070f731fb7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-761e-b707-e8070f731fb7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-761e-b707-e8070f731fb7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7ddc-a46f-9d7df749a015" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019c76d3-b5f6-761e-b707-e8070f731fb7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7ddc-a46f-9d7df749a015" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_019c76d3-b5f6-7ff0-abbc-76d0e5452424" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7ddc-a46f-9d7df749a015" xlink:to="loc_us-gaap_ComputerEquipmentMember_019c76d3-b5f6-7ff0-abbc-76d0e5452424" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_FurnitureAndOfficeEquipmentMember_019c76d3-b5f6-7e1d-be72-2225ce3d298d" xlink:href="rskd-20251231.xsd#rskd_FurnitureAndOfficeEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7ddc-a46f-9d7df749a015" xlink:to="loc_rskd_FurnitureAndOfficeEquipmentMember_019c76d3-b5f6-7e1d-be72-2225ce3d298d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_019c76d3-b5f6-7ea7-9c70-cf588b76aaf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019c76d3-b5f6-7ddc-a46f-9d7df749a015" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_019c76d3-b5f6-7ea7-9c70-cf588b76aaf1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019c76d3-b5f6-7e3a-a191-35f7815bce3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-78df-9502-5593639846a3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019c76d3-b5f6-7e3a-a191-35f7815bce3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019c76d3-b5f6-7f26-8b33-35d6304c4d52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-78df-9502-5593639846a3" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019c76d3-b5f6-7f26-8b33-35d6304c4d52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019c76d3-b5f6-729a-aeb3-795f27c087ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f6-78df-9502-5593639846a3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019c76d3-b5f6-729a-aeb3-795f27c087ae" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/ConsolidatedBalanceSheetComponentsNarrativeDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#ConsolidatedBalanceSheetComponentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/ConsolidatedBalanceSheetComponentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-7edc-9540-2388881b2463" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f7-718a-8fb1-adf48213b4ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-7edc-9540-2388881b2463" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f7-718a-8fb1-adf48213b4ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_019c76d3-b5f7-72be-a957-948487edff4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f7-718a-8fb1-adf48213b4ad" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_019c76d3-b5f7-72be-a957-948487edff4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c76d3-b5f7-72be-a957-948487edff4e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c76d3-b5f7-72be-a957-948487edff4e" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c76d3-b5f7-72be-a957-948487edff4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_019c76d3-b5f7-70e2-8f89-6fa72c2c4af5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_019c76d3-b5f7-72be-a957-948487edff4e" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_019c76d3-b5f7-70e2-8f89-6fa72c2c4af5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019c76d3-b5f7-7228-91a1-4398893194bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_019c76d3-b5f7-70e2-8f89-6fa72c2c4af5" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_019c76d3-b5f7-7228-91a1-4398893194bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_019c76d3-b5f7-7794-a8f2-4a3d28e5dbfb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-7edc-9540-2388881b2463" xlink:to="loc_us-gaap_Depreciation_019c76d3-b5f7-7794-a8f2-4a3d28e5dbfb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_019c76d3-b5f7-7fbf-82f8-c490f0ce9931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-7edc-9540-2388881b2463" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_019c76d3-b5f7-7fbf-82f8-c490f0ce9931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019c76d3-b5f7-742c-a414-73caed1b7e21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-7edc-9540-2388881b2463" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_019c76d3-b5f7-742c-a414-73caed1b7e21" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/ConsolidatedBalanceSheetComponentsPropertyPlantandEquipmentbyGeographicRegionDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#ConsolidatedBalanceSheetComponentsPropertyPlantandEquipmentbyGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/ConsolidatedBalanceSheetComponentsPropertyPlantandEquipmentbyGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-73e7-b004-c03402aef915" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f7-7f72-8d9a-cb51e633f77a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-73e7-b004-c03402aef915" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f7-7f72-8d9a-cb51e633f77a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-744b-908a-086167c72e08" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019c76d3-b5f7-7f72-8d9a-cb51e633f77a" xlink:to="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-744b-908a-086167c72e08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-744b-908a-086167c72e08_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-744b-908a-086167c72e08" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-744b-908a-086167c72e08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-75c8-8ac6-f9380fd556a2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-744b-908a-086167c72e08" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-75c8-8ac6-f9380fd556a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c76d3-b5f7-73b7-b945-48f6455dd390" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-75c8-8ac6-f9380fd556a2" xlink:to="loc_country_US_019c76d3-b5f7-73b7-b945-48f6455dd390" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_019c76d3-b5f7-7619-bcec-287fda109153" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-75c8-8ac6-f9380fd556a2" xlink:to="loc_country_IL_019c76d3-b5f7-7619-bcec-287fda109153" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_NonIsraelAndNonUSMember_019c76d3-b5f7-7cbc-8834-1f2db07c337d" xlink:href="rskd-20251231.xsd#rskd_NonIsraelAndNonUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-75c8-8ac6-f9380fd556a2" xlink:to="loc_rskd_NonIsraelAndNonUSMember_019c76d3-b5f7-7cbc-8834-1f2db07c337d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_019c76d3-b5f7-74f9-b29e-f03d848e0c93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019c76d3-b5f7-73e7-b004-c03402aef915" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_019c76d3-b5f7-74f9-b29e-f03d848e0c93" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/LeasesByGeographicRegionDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#LeasesByGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/LeasesByGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_019c76d3-b5f7-7796-ba87-59c4e6eb75a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_019c76d3-b5f7-7a19-ac50-043e34b59ad0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019c76d3-b5f7-7796-ba87-59c4e6eb75a2" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_019c76d3-b5f7-7a19-ac50-043e34b59ad0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-75d2-ad2f-a84d5f8e25e7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_019c76d3-b5f7-7a19-ac50-043e34b59ad0" xlink:to="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-75d2-ad2f-a84d5f8e25e7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-75d2-ad2f-a84d5f8e25e7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-75d2-ad2f-a84d5f8e25e7" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-75d2-ad2f-a84d5f8e25e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-7729-9124-864abaf83ea2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b5f7-75d2-ad2f-a84d5f8e25e7" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-7729-9124-864abaf83ea2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_019c76d3-b5f7-786a-b418-660d7ae5a6c4" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-7729-9124-864abaf83ea2" xlink:to="loc_country_IL_019c76d3-b5f7-786a-b418-660d7ae5a6c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c76d3-b5f7-7995-8b00-473c539fbb04" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b5f7-7729-9124-864abaf83ea2" xlink:to="loc_country_US_019c76d3-b5f7-7995-8b00-473c539fbb04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c76d3-b5f7-7086-953a-ba43be2d915d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_019c76d3-b5f7-7796-ba87-59c4e6eb75a2" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019c76d3-b5f7-7086-953a-ba43be2d915d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/OrdinaryShareWarrantsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#OrdinaryShareWarrantsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/OrdinaryShareWarrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityLineItems_019c76d3-b5f7-7808-95c5-eeeb3a976bc0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityByClassOfStockTable_019c76d3-b5f7-7341-9eff-e85e7e6160ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TemporaryEquityByClassOfStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_TemporaryEquityLineItems_019c76d3-b5f7-7808-95c5-eeeb3a976bc0" xlink:to="loc_us-gaap_TemporaryEquityByClassOfStockTable_019c76d3-b5f7-7341-9eff-e85e7e6160ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f7-73c9-9f61-0cea73c0e900" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TemporaryEquityByClassOfStockTable_019c76d3-b5f7-7341-9eff-e85e7e6160ea" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f7-73c9-9f61-0cea73c0e900" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f7-73c9-9f61-0cea73c0e900_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f7-73c9-9f61-0cea73c0e900" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f7-73c9-9f61-0cea73c0e900_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f7-773b-8768-9d137a36b6c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_019c76d3-b5f7-73c9-9f61-0cea73c0e900" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f7-773b-8768-9d137a36b6c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_019c76d3-b5f7-7142-a3dc-88ca6eacba6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f7-773b-8768-9d137a36b6c8" xlink:to="loc_us-gaap_WarrantMember_019c76d3-b5f7-7142-a3dc-88ca6eacba6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_WarrantIssuedToCustomersMember_019c76d3-b5f7-7e26-9389-bea5d42cf587" xlink:href="rskd-20251231.xsd#rskd_WarrantIssuedToCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_019c76d3-b5f7-773b-8768-9d137a36b6c8" xlink:to="loc_rskd_WarrantIssuedToCustomersMember_019c76d3-b5f7-7e26-9389-bea5d42cf587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-7e3e-b94f-d001b21da0de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TemporaryEquityByClassOfStockTable_019c76d3-b5f7-7341-9eff-e85e7e6160ea" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-7e3e-b94f-d001b21da0de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-7e3e-b94f-d001b21da0de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-7e3e-b94f-d001b21da0de" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-7e3e-b94f-d001b21da0de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-7c3f-9042-98931794af46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-7e3e-b94f-d001b21da0de" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-7c3f-9042-98931794af46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b5f7-7547-baa8-dde9cfed4b97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-7c3f-9042-98931794af46" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b5f7-7547-baa8-dde9cfed4b97" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b5f7-7684-a83d-f79a97bd9117" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-7c3f-9042-98931794af46" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b5f7-7684-a83d-f79a97bd9117" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-742b-9210-aff2e56f7e90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TemporaryEquityByClassOfStockTable_019c76d3-b5f7-7341-9eff-e85e7e6160ea" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-742b-9210-aff2e56f7e90" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-742b-9210-aff2e56f7e90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-742b-9210-aff2e56f7e90" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-742b-9210-aff2e56f7e90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7904-81cd-ede94c0fc2d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-742b-9210-aff2e56f7e90" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7904-81cd-ede94c0fc2d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember_019c76d3-b5f7-77ee-b53c-e2dc852af68f" xlink:href="rskd-20251231.xsd#rskd_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7904-81cd-ede94c0fc2d5" xlink:to="loc_rskd_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember_019c76d3-b5f7-77ee-b53c-e2dc852af68f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-719d-8c52-afb446aa56c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_TemporaryEquityByClassOfStockTable_019c76d3-b5f7-7341-9eff-e85e7e6160ea" xlink:to="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-719d-8c52-afb446aa56c5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-719d-8c52-afb446aa56c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-719d-8c52-afb446aa56c5" xlink:to="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-719d-8c52-afb446aa56c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-7a56-9147-e0a316cdc055" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-719d-8c52-afb446aa56c5" xlink:to="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-7a56-9147-e0a316cdc055" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_A2013EquityIncentivePlanMember_019c76d3-b5f7-736b-95e4-317888952a5a" xlink:href="rskd-20251231.xsd#rskd_A2013EquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-7a56-9147-e0a316cdc055" xlink:to="loc_rskd_A2013EquityIncentivePlanMember_019c76d3-b5f7-736b-95e4-317888952a5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019c76d3-b5f7-79ef-918c-9693079ad97e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_019c76d3-b5f7-7808-95c5-eeeb3a976bc0" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_019c76d3-b5f7-79ef-918c-9693079ad97e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019c76d3-b5f7-7960-87ed-ded0b2fcc157" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_019c76d3-b5f7-7808-95c5-eeeb3a976bc0" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_019c76d3-b5f7-7960-87ed-ded0b2fcc157" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019c76d3-b5f7-7266-9db7-e07a58830e74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TemporaryEquityLineItems_019c76d3-b5f7-7808-95c5-eeeb3a976bc0" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019c76d3-b5f7-7266-9db7-e07a58830e74" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanNarrativeDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#OrdinarySharesandEquityIncentivePlanNarrativeDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-7193-a4e6-502d7b23fd3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-7193-a4e6-502d7b23fd3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-7193-a4e6-502d7b23fd3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-7193-a4e6-502d7b23fd3c" xlink:to="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-7193-a4e6-502d7b23fd3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-720b-93f2-e75d76be7f86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019c76d3-b5f7-7193-a4e6-502d7b23fd3c" xlink:to="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-720b-93f2-e75d76be7f86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_A2013EquityIncentivePlanMember_019c76d3-b5f7-7d3c-a2ae-e0d95be33359" xlink:href="rskd-20251231.xsd#rskd_A2013EquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-720b-93f2-e75d76be7f86" xlink:to="loc_rskd_A2013EquityIncentivePlanMember_019c76d3-b5f7-7d3c-a2ae-e0d95be33359" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_A2021EquityIncentivePlanMember_019c76d3-b5f7-798f-8b81-b2046449c404" xlink:href="rskd-20251231.xsd#rskd_A2021EquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019c76d3-b5f7-720b-93f2-e75d76be7f86" xlink:to="loc_rskd_A2021EquityIncentivePlanMember_019c76d3-b5f7-798f-8b81-b2046449c404" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-7c73-aa69-a263b93de4d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-7c73-aa69-a263b93de4d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7c73-aa69-a263b93de4d8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-7c73-aa69-a263b93de4d8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7c73-aa69-a263b93de4d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7763-86cf-17a8d59c28c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b5f7-7c73-aa69-a263b93de4d8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7763-86cf-17a8d59c28c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b5f7-75fb-a8ba-2ad92d39997c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7763-86cf-17a8d59c28c0" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b5f7-75fb-a8ba-2ad92d39997c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019c76d3-b5f7-7fa3-bd8b-0f23afd18712" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b5f7-7763-86cf-17a8d59c28c0" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019c76d3-b5f7-7fa3-bd8b-0f23afd18712" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_019c76d3-b5f7-7cf3-b7c9-84856e416c49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_us-gaap_VestingAxis_019c76d3-b5f7-7cf3-b7c9-84856e416c49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019c76d3-b5f7-7cf3-b7c9-84856e416c49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_019c76d3-b5f7-7cf3-b7c9-84856e416c49" xlink:to="loc_us-gaap_VestingDomain_019c76d3-b5f7-7cf3-b7c9-84856e416c49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_019c76d3-b5f7-7809-84c0-e6f88f8b57df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_019c76d3-b5f7-7cf3-b7c9-84856e416c49" xlink:to="loc_us-gaap_VestingDomain_019c76d3-b5f7-7809-84c0-e6f88f8b57df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019c76d3-b5f7-7d90-8eeb-137b61714272" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_019c76d3-b5f7-7809-84c0-e6f88f8b57df" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_019c76d3-b5f7-7d90-8eeb-137b61714272" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_019c76d3-b5f7-7c72-bb82-b752c4e45d8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_019c76d3-b5f7-7809-84c0-e6f88f8b57df" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_019c76d3-b5f7-7c72-bb82-b752c4e45d8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019ca0b3-b743-7615-bbc4-e8fb56e8e3c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019ca0b3-b743-7615-bbc4-e8fb56e8e3c7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019ca0b3-b743-7615-bbc4-e8fb56e8e3c7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019ca0b3-b743-7615-bbc4-e8fb56e8e3c7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019ca0b3-b743-7615-bbc4-e8fb56e8e3c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019ca0b3-de12-7475-bccb-105fade81fa8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019ca0b3-b743-7615-bbc4-e8fb56e8e3c7" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019ca0b3-de12-7475-bccb-105fade81fa8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareRepurchaseProgramMember_019ca0b4-36e8-7741-891e-9602ef2b2446" xlink:href="rskd-20251231.xsd#rskd_ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019ca0b3-de12-7475-bccb-105fade81fa8" xlink:to="loc_rskd_ShareRepurchaseProgramMember_019ca0b4-36e8-7741-891e-9602ef2b2446" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-704e-b869-bcabcdd34d95" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-704e-b869-bcabcdd34d95" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-704e-b869-bcabcdd34d95_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-704e-b869-bcabcdd34d95" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-704e-b869-bcabcdd34d95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-740c-9fd0-52e1fead7550" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b5f7-704e-b869-bcabcdd34d95" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-740c-9fd0-52e1fead7550" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b5f7-7b20-8762-4639f682b281" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-740c-9fd0-52e1fead7550" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b5f7-7b20-8762-4639f682b281" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b5f7-79f9-a452-5546ec1984be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b5f7-740c-9fd0-52e1fead7550" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b5f7-79f9-a452-5546ec1984be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_019c76d3-b5f7-787a-a674-2d2ed3a83fb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_019c76d3-b5f7-787a-a674-2d2ed3a83fb4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_019c76d3-b5f7-787a-a674-2d2ed3a83fb4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_019c76d3-b5f7-787a-a674-2d2ed3a83fb4" xlink:to="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_019c76d3-b5f7-787a-a674-2d2ed3a83fb4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_019c76d3-b5f7-734f-b035-d8c06f8ed12c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_019c76d3-b5f7-787a-a674-2d2ed3a83fb4" xlink:to="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_019c76d3-b5f7-734f-b035-d8c06f8ed12c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_A2021EmployeeSharePurchasePlanMember_019c76d3-b5f7-78d9-9331-9de87f9160dc" xlink:href="rskd-20251231.xsd#rskd_A2021EmployeeSharePurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_019c76d3-b5f7-734f-b035-d8c06f8ed12c" xlink:to="loc_rskd_A2021EmployeeSharePurchasePlanMember_019c76d3-b5f7-78d9-9331-9de87f9160dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019c76d3-b5f7-7de7-98f6-779c19dcae2d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_srt_TitleOfIndividualAxis_019c76d3-b5f7-7de7-98f6-779c19dcae2d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b5f7-7de7-98f6-779c19dcae2d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019c76d3-b5f7-7de7-98f6-779c19dcae2d" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b5f7-7de7-98f6-779c19dcae2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b5f7-70a2-8da7-e0bd27188972" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019c76d3-b5f7-7de7-98f6-779c19dcae2d" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b5f7-70a2-8da7-e0bd27188972" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ChiefExecutiveOfficerMember_019c76d3-b5f7-75df-aac7-1ee2b02c6a4c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ChiefExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b5f7-70a2-8da7-e0bd27188972" xlink:to="loc_srt_ChiefExecutiveOfficerMember_019c76d3-b5f7-75df-aac7-1ee2b02c6a4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f7-7553-97a1-04e07ed61982" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f7-7553-97a1-04e07ed61982" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c76d3-b5f7-7553-97a1-04e07ed61982_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f7-7553-97a1-04e07ed61982" xlink:to="loc_us-gaap_EquityComponentDomain_019c76d3-b5f7-7553-97a1-04e07ed61982_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019c76d3-b5f7-7a19-91aa-270f854a657a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019c76d3-b5f7-7553-97a1-04e07ed61982" xlink:to="loc_us-gaap_EquityComponentDomain_019c76d3-b5f7-7a19-91aa-270f854a657a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019c76d3-b5f7-78f0-a1db-3ff3bb447835" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019c76d3-b5f7-7a19-91aa-270f854a657a" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019c76d3-b5f7-78f0-a1db-3ff3bb447835" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c76d3-b5f7-764d-8ff2-97321e2e871c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-7b6f-bf77-dd5b74e783c6" xlink:to="loc_srt_RangeAxis_019c76d3-b5f7-764d-8ff2-97321e2e871c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b5f7-764d-8ff2-97321e2e871c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c76d3-b5f7-764d-8ff2-97321e2e871c" xlink:to="loc_srt_RangeMember_019c76d3-b5f7-764d-8ff2-97321e2e871c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b5f7-7b47-b439-3f3b5d0b05db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c76d3-b5f7-764d-8ff2-97321e2e871c" xlink:to="loc_srt_RangeMember_019c76d3-b5f7-7b47-b439-3f3b5d0b05db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c76d3-b5f7-7344-aaaf-d0bda167271c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b5f7-7b47-b439-3f3b5d0b05db" xlink:to="loc_srt_MinimumMember_019c76d3-b5f7-7344-aaaf-d0bda167271c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c76d3-b5f7-7d8c-8477-566c944b3563" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b5f7-7b47-b439-3f3b5d0b05db" xlink:to="loc_srt_MaximumMember_019c76d3-b5f7-7d8c-8477-566c944b3563" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019c76d3-b5f7-70af-8a31-9c51d67f0033" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019c76d3-b5f7-70af-8a31-9c51d67f0033" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareRepurchaseProgramAuthorizedAmountUtilizedToDate_019c76d3-b5f7-70bb-8bdf-9bd5d29ba19b" xlink:href="rskd-20251231.xsd#rskd_ShareRepurchaseProgramAuthorizedAmountUtilizedToDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_ShareRepurchaseProgramAuthorizedAmountUtilizedToDate_019c76d3-b5f7-70bb-8bdf-9bd5d29ba19b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_StockRepurchaseProgramTransactionCosts_019c76d3-b5f7-7465-9bb7-fb12f4dbe854" xlink:href="rskd-20251231.xsd#rskd_StockRepurchaseProgramTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_StockRepurchaseProgramTransactionCosts_019c76d3-b5f7-7465-9bb7-fb12f4dbe854" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019c76d3-b5f7-7e65-a15c-3dc762df0455" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019c76d3-b5f7-7e65-a15c-3dc762df0455" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c76d3-b5f7-7029-a86e-512d736ae4f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019c76d3-b5f7-7029-a86e-512d736ae4f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019cbe6c-2180-7c67-9c14-53a0894cbf89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019cbe6c-2180-7c67-9c14-53a0894cbf89" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019c76d3-b5f7-717a-a411-57fc842579aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019c76d3-b5f7-717a-a411-57fc842579aa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_CommonStockCapitalSharesReservedForFutureIssuanceAnnualIncreasePercent_019c76d3-b5f7-7471-8430-5c196cae5863" xlink:href="rskd-20251231.xsd#rskd_CommonStockCapitalSharesReservedForFutureIssuanceAnnualIncreasePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_CommonStockCapitalSharesReservedForFutureIssuanceAnnualIncreasePercent_019c76d3-b5f7-7471-8430-5c196cae5863" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019c76d3-b5f7-701c-8189-178f70780169" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_019c76d3-b5f7-701c-8189-178f70780169" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019c76d3-b5f7-7075-9a50-29bb6e31a68f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_019c76d3-b5f7-7075-9a50-29bb6e31a68f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019c76d3-b5f7-737d-ac4e-974f1c278bb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_019c76d3-b5f7-737d-ac4e-974f1c278bb3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c76d3-b5f7-7e1f-818f-4d25db61681a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c76d3-b5f7-7e1f-818f-4d25db61681a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_019c76d3-b5f7-76f3-a0f0-d1c5f6aaea0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1_019c76d3-b5f7-76f3-a0f0-d1c5f6aaea0a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019c76d3-b5f7-7e90-a1e3-02624e1d900f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019c76d3-b5f7-7e90-a1e3-02624e1d900f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019c76d3-b5f7-7fc9-8f14-0b2bb7021b31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_019c76d3-b5f7-7fc9-8f14-0b2bb7021b31" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019c76d3-b5f7-7dee-8ad2-0342bbc56793" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019c76d3-b5f7-7dee-8ad2-0342bbc56793" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c76d3-b5f7-78fb-b8a7-f075afb3963f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c76d3-b5f7-78fb-b8a7-f075afb3963f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c76d3-b5f7-79c3-8e73-4f1a22bae29f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c76d3-b5f7-79c3-8e73-4f1a22bae29f" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019c76d3-b5f7-70a8-8d72-146bee1dd5f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_019c76d3-b5f7-70a8-8d72-146bee1dd5f3" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_CommonStockCapitalSharesReservedForFutureIssuanceMaximumOwnershipPercentage_019c76d3-b5f7-75c1-8a69-50a2c1d27bd6" xlink:href="rskd-20251231.xsd#rskd_CommonStockCapitalSharesReservedForFutureIssuanceMaximumOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_CommonStockCapitalSharesReservedForFutureIssuanceMaximumOwnershipPercentage_019c76d3-b5f7-75c1-8a69-50a2c1d27bd6" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_019c76d3-b5f7-76a5-9e9d-15a7f58eb7eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_019c76d3-b5f7-76a5-9e9d-15a7f58eb7eb" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranches_019c76d3-b5f7-7588-a939-13494633856b" xlink:href="rskd-20251231.xsd#rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranches"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranches_019c76d3-b5f7-7588-a939-13494633856b" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsStockPriceGoal_019c76d3-b5f7-7789-9cfd-258c166d9dd5" xlink:href="rskd-20251231.xsd#rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsStockPriceGoal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsStockPriceGoal_019c76d3-b5f7-7789-9cfd-258c166d9dd5" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019c76d3-b5f7-7b8c-96a2-b79cc9b4d174" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_019c76d3-b5f7-7b8c-96a2-b79cc9b4d174" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsStockPriceRatioComparedToIPOPrice_019c76d3-b5f7-70eb-998a-e92f6d544be5" xlink:href="rskd-20251231.xsd#rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsStockPriceRatioComparedToIPOPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsStockPriceRatioComparedToIPOPrice_019c76d3-b5f7-70eb-998a-e92f6d544be5" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranchesEarnedOrVested_019c76d3-b5f7-7f00-9a13-79aaae11d1c5" xlink:href="rskd-20251231.xsd#rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranchesEarnedOrVested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_rskd_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranchesEarnedOrVested_019c76d3-b5f7-7f00-9a13-79aaae11d1c5" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockPricePerShare_019c76d3-b5f7-7f32-951a-d514acc9a0b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SaleOfStockPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b5f7-7639-be37-eb55fcc38081" xlink:to="loc_us-gaap_SaleOfStockPricePerShare_019c76d3-b5f7-7f32-951a-d514acc9a0b8" xlink:type="arc" order="26"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanScheduleofOrdinarySharesReservedforIssuanceDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#OrdinarySharesandEquityIncentivePlanScheduleofOrdinarySharesReservedforIssuanceDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanScheduleofOrdinarySharesReservedforIssuanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7374-afa0-dc420b4c226b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-71ac-81a1-119d7517e120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7374-afa0-dc420b4c226b" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-71ac-81a1-119d7517e120" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_019c76d3-b5f7-74b0-b03d-1f104399e247" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockByUniqueDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-71ac-81a1-119d7517e120" xlink:to="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_019c76d3-b5f7-74b0-b03d-1f104399e247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockNameDomain_019c76d3-b5f7-74b0-b03d-1f104399e247_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_019c76d3-b5f7-74b0-b03d-1f104399e247" xlink:to="loc_us-gaap_ConversionOfStockNameDomain_019c76d3-b5f7-74b0-b03d-1f104399e247_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockNameDomain_019c76d3-b5f7-7002-8070-36ae0643657a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConversionOfStockNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConversionOfStockByUniqueDescriptionAxis_019c76d3-b5f7-74b0-b03d-1f104399e247" xlink:to="loc_us-gaap_ConversionOfStockNameDomain_019c76d3-b5f7-7002-8070-36ae0643657a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_WarrantsToPurchaseOrdinarySharesMember_019c76d3-b5f7-72ff-b30c-52c0503ca3bf" xlink:href="rskd-20251231.xsd#rskd_WarrantsToPurchaseOrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConversionOfStockNameDomain_019c76d3-b5f7-7002-8070-36ae0643657a" xlink:to="loc_rskd_WarrantsToPurchaseOrdinarySharesMember_019c76d3-b5f7-72ff-b30c-52c0503ca3bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_019c76d3-b6d4-729a-8586-4f5e891d56fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-71ac-81a1-119d7517e120" xlink:to="loc_us-gaap_PlanNameAxis_019c76d3-b6d4-729a-8586-4f5e891d56fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019c76d3-b6d4-729a-8586-4f5e891d56fa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_019c76d3-b6d4-729a-8586-4f5e891d56fa" xlink:to="loc_us-gaap_PlanNameDomain_019c76d3-b6d4-729a-8586-4f5e891d56fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_019c76d3-b6d4-703c-a52d-715954844322" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_019c76d3-b6d4-729a-8586-4f5e891d56fa" xlink:to="loc_us-gaap_PlanNameDomain_019c76d3-b6d4-703c-a52d-715954844322" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_A2013EquityIncentivePlanMember_019c76d3-b6d4-7a52-b13a-92ca7ba83940" xlink:href="rskd-20251231.xsd#rskd_A2013EquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019c76d3-b6d4-703c-a52d-715954844322" xlink:to="loc_rskd_A2013EquityIncentivePlanMember_019c76d3-b6d4-7a52-b13a-92ca7ba83940" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_A2021EquityIncentivePlanMember_019c76d3-b6d4-7069-815e-6ca7c670762e" xlink:href="rskd-20251231.xsd#rskd_A2021EquityIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_019c76d3-b6d4-703c-a52d-715954844322" xlink:to="loc_rskd_A2021EquityIncentivePlanMember_019c76d3-b6d4-7069-815e-6ca7c670762e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-79e5-af5d-6e6ea267b498" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b5f7-71ac-81a1-119d7517e120" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-79e5-af5d-6e6ea267b498" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-79e5-af5d-6e6ea267b498_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-79e5-af5d-6e6ea267b498" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-79e5-af5d-6e6ea267b498_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7ce9-bddf-19965b6345e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-79e5-af5d-6e6ea267b498" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7ce9-bddf-19965b6345e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember_019c76d3-b6d4-7690-8dd3-1bd1cf6bf469" xlink:href="rskd-20251231.xsd#rskd_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7ce9-bddf-19965b6345e6" xlink:to="loc_rskd_ShareBasedPaymentArrangementOptionAndRestrictedStockUnitsMember_019c76d3-b6d4-7690-8dd3-1bd1cf6bf469" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019c76d3-b6d4-75ab-a76a-16e4c5c91607" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7374-afa0-dc420b4c226b" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_019c76d3-b6d4-75ab-a76a-16e4c5c91607" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanStockOptionActivityDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#OrdinarySharesandEquityIncentivePlanStockOptionActivityDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanStockOptionActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7343-bd5c-921fcc06ec94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-72ef-9049-2efeb5dcd4d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7343-bd5c-921fcc06ec94" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-72ef-9049-2efeb5dcd4d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7946-b6de-a59e654890e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-72ef-9049-2efeb5dcd4d1" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7946-b6de-a59e654890e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7946-b6de-a59e654890e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7946-b6de-a59e654890e8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7946-b6de-a59e654890e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7881-8241-ff7145b1fc52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7946-b6de-a59e654890e8" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7881-8241-ff7145b1fc52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019c76d3-b6d4-7eac-ab7a-cbde7e5a6495" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7881-8241-ff7145b1fc52" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019c76d3-b6d4-7eac-ab7a-cbde7e5a6495" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-7a69-93c7-4ee0d155b724" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7881-8241-ff7145b1fc52" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-7a69-93c7-4ee0d155b724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019c76d3-b6d4-71a6-bc01-fb7e3c5e5ddf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7343-bd5c-921fcc06ec94" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019c76d3-b6d4-71a6-bc01-fb7e3c5e5ddf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019c76d3-b6d4-7e2e-9f96-e3c3c809444f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019c76d3-b6d4-71a6-bc01-fb7e3c5e5ddf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019c76d3-b6d4-7e2e-9f96-e3c3c809444f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019c76d3-b6d4-7b47-8cce-7a30d249342e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019c76d3-b6d4-71a6-bc01-fb7e3c5e5ddf" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_019c76d3-b6d4-7b47-8cce-7a30d249342e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_019c76d3-b6d4-76cd-a1f5-552b48f385c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_019c76d3-b6d4-71a6-bc01-fb7e3c5e5ddf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_019c76d3-b6d4-76cd-a1f5-552b48f385c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_019c76d3-b6d4-79be-b959-2806baea3a6b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019c76d3-b6d4-7747-970b-f4cb1f3943de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7343-bd5c-921fcc06ec94" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019c76d3-b6d4-7747-970b-f4cb1f3943de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019c76d3-b6d4-7b8f-96ad-f5d57725f3fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019c76d3-b6d4-7747-970b-f4cb1f3943de" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019c76d3-b6d4-7b8f-96ad-f5d57725f3fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019c76d3-b6d4-700d-b7bd-528dda756b0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019c76d3-b6d4-7747-970b-f4cb1f3943de" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_019c76d3-b6d4-700d-b7bd-528dda756b0e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_019c76d3-b6d4-7db4-9c32-3712e70ece82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_019c76d3-b6d4-7747-970b-f4cb1f3943de" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_019c76d3-b6d4-7db4-9c32-3712e70ece82" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_019c76d3-b6d4-7817-ad42-3743f43f7041" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7343-bd5c-921fcc06ec94" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_019c76d3-b6d4-7a1c-ace3-f90ee0d53cc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_019c76d3-b6d4-7a1c-ace3-f90ee0d53cc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_019c76d3-b6d4-7bdd-88ff-1771e2a445a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_019c76d3-b6d4-7bdd-88ff-1771e2a445a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_019c76d3-b6d4-703f-91ec-f0e9fb9eeb8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_019c76d3-b6d4-703f-91ec-f0e9fb9eeb8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019c76d3-b6d4-7882-a1e2-8f158a1a7b21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_019c76d3-b6d4-7882-a1e2-8f158a1a7b21" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_019c76d3-b6d4-7c48-b9af-afd3b79fc4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_019c76d3-b6d4-7c48-b9af-afd3b79fc4b5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_019c76d3-b6d4-7679-8dbb-f82c7436710e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_019c76d3-b6d4-7679-8dbb-f82c7436710e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_019c76d3-b6d4-7605-8924-fc18867ffc08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract_019c76d3-b6d4-7ccd-9c0f-74e061423f96" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_019c76d3-b6d4-7605-8924-fc18867ffc08" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019c76d3-b6d4-7a16-ba26-ce6af921507c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7343-bd5c-921fcc06ec94" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_019c76d3-b6d4-7a16-ba26-ce6af921507c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanBlackScholesAssumptionsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#OrdinarySharesandEquityIncentivePlanBlackScholesAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanBlackScholesAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7aca-b862-1db10c32fb37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-799e-92da-0441157f3cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7aca-b862-1db10c32fb37" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-799e-92da-0441157f3cbd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-732f-b86b-7d81e44a659e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-799e-92da-0441157f3cbd" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-732f-b86b-7d81e44a659e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-732f-b86b-7d81e44a659e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-732f-b86b-7d81e44a659e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-732f-b86b-7d81e44a659e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7026-8056-6f8c79973b4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-732f-b86b-7d81e44a659e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7026-8056-6f8c79973b4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019c76d3-b6d4-72fa-8b74-cad8f4a9f3d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7026-8056-6f8c79973b4f" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019c76d3-b6d4-72fa-8b74-cad8f4a9f3d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019c76d3-b6d4-733f-b5cc-abe043444d20" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-799e-92da-0441157f3cbd" xlink:to="loc_srt_RangeAxis_019c76d3-b6d4-733f-b5cc-abe043444d20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b6d4-733f-b5cc-abe043444d20_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019c76d3-b6d4-733f-b5cc-abe043444d20" xlink:to="loc_srt_RangeMember_019c76d3-b6d4-733f-b5cc-abe043444d20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019c76d3-b6d4-7d58-a1cc-3dd1a30d8ac2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019c76d3-b6d4-733f-b5cc-abe043444d20" xlink:to="loc_srt_RangeMember_019c76d3-b6d4-7d58-a1cc-3dd1a30d8ac2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019c76d3-b6d4-7d4b-88f0-c24042d0bae2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b6d4-7d58-a1cc-3dd1a30d8ac2" xlink:to="loc_srt_MinimumMember_019c76d3-b6d4-7d4b-88f0-c24042d0bae2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019c76d3-b6d4-7de1-befa-64feb844d4c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019c76d3-b6d4-7d58-a1cc-3dd1a30d8ac2" xlink:to="loc_srt_MaximumMember_019c76d3-b6d4-7de1-befa-64feb844d4c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019c76d3-b6d4-767e-8dd4-e0e3b47693d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7aca-b862-1db10c32fb37" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019c76d3-b6d4-767e-8dd4-e0e3b47693d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019c76d3-b6d4-70e3-b0d2-8e5918aaa44c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7aca-b862-1db10c32fb37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019c76d3-b6d4-70e3-b0d2-8e5918aaa44c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019c76d3-b6d4-755b-96c1-11dcb1829428" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7aca-b862-1db10c32fb37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019c76d3-b6d4-755b-96c1-11dcb1829428" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019c76d3-b6d4-76f2-8ab9-62ed6eb220dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7aca-b862-1db10c32fb37" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019c76d3-b6d4-76f2-8ab9-62ed6eb220dc" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanRSUActivityDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#OrdinarySharesandEquityIncentivePlanRSUActivityDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanRSUActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7804-ac2a-4a5af6cead71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-7a87-a0aa-9a2ffc468bb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7804-ac2a-4a5af6cead71" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-7a87-a0aa-9a2ffc468bb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7014-97d1-de19395d1350" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-7a87-a0aa-9a2ffc468bb9" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7014-97d1-de19395d1350" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7014-97d1-de19395d1350_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7014-97d1-de19395d1350" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7014-97d1-de19395d1350_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7265-a3aa-291e8597bc28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7014-97d1-de19395d1350" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7265-a3aa-291e8597bc28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-75b8-b52a-2a4b87aec774" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7265-a3aa-291e8597bc28" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-75b8-b52a-2a4b87aec774" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019ca096-066e-77ad-953e-e4f073213e3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-7a87-a0aa-9a2ffc468bb9" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019ca096-066e-77ad-953e-e4f073213e3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ca096-066e-77ad-953e-e4f073213e3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ca096-066e-77ad-953e-e4f073213e3b" xlink:to="loc_us-gaap_ClassOfStockDomain_019ca096-066e-77ad-953e-e4f073213e3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ca096-2865-7672-986d-42846c33ccc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ca096-066e-77ad-953e-e4f073213e3b" xlink:to="loc_us-gaap_ClassOfStockDomain_019ca096-2865-7672-986d-42846c33ccc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019ca096-486b-7dcc-8a58-7531af6283a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ca096-2865-7672-986d-42846c33ccc7" xlink:to="loc_us-gaap_CommonClassAMember_019ca096-486b-7dcc-8a58-7531af6283a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c76d3-b6d4-73ab-9244-d161b2d33937" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7804-ac2a-4a5af6cead71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c76d3-b6d4-73ab-9244-d161b2d33937" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c76d3-b6d4-7b39-824f-ab547591a41b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c76d3-b6d4-73ab-9244-d161b2d33937" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c76d3-b6d4-7b39-824f-ab547591a41b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c76d3-b6d4-7f72-aff9-b54a77991ab9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c76d3-b6d4-73ab-9244-d161b2d33937" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_019c76d3-b6d4-7f72-aff9-b54a77991ab9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c76d3-b6d4-70aa-ab26-2eb97f7810fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c76d3-b6d4-73ab-9244-d161b2d33937" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_019c76d3-b6d4-70aa-ab26-2eb97f7810fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c76d3-b6d4-7aea-9f04-4b6ef5c9b90f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_019c76d3-b6d4-73ab-9244-d161b2d33937" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_019c76d3-b6d4-7aea-9f04-4b6ef5c9b90f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_019c76d3-b6d4-7fa5-8bd6-1ca9d31e8040" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c76d3-b6d4-78a7-a79f-9da4c29ff329" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7804-ac2a-4a5af6cead71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c76d3-b6d4-78a7-a79f-9da4c29ff329" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c76d3-b6d4-7468-958c-774b2c0cfa4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c76d3-b6d4-78a7-a79f-9da4c29ff329" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c76d3-b6d4-7468-958c-774b2c0cfa4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c76d3-b6d4-7af0-b4e3-4b91590040a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c76d3-b6d4-78a7-a79f-9da4c29ff329" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019c76d3-b6d4-7af0-b4e3-4b91590040a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c76d3-b6d4-7642-af78-36b76436e906" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c76d3-b6d4-78a7-a79f-9da4c29ff329" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_019c76d3-b6d4-7642-af78-36b76436e906" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c76d3-b6d4-7fe6-acae-9d12fcf65cc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_019c76d3-b6d4-78a7-a79f-9da4c29ff329" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_019c76d3-b6d4-7fe6-acae-9d12fcf65cc1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_019c76d3-b6d4-76f8-b7bb-f8ede6209871" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019ca093-f327-769e-a4b4-15abea662ecb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7804-ac2a-4a5af6cead71" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_019ca093-f327-769e-a4b4-15abea662ecb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_019ca094-764f-7213-abe3-221dac6f47d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7804-ac2a-4a5af6cead71" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_019ca094-764f-7213-abe3-221dac6f47d2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanSharebasedCompensationExpenseDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#OrdinarySharesandEquityIncentivePlanSharebasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/OrdinarySharesandEquityIncentivePlanSharebasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7182-90a8-2109e08ad633" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-76b0-8f1c-1bf64fd3a324" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7182-90a8-2109e08ad633" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-76b0-8f1c-1bf64fd3a324" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b6d4-722e-97a2-e9e5f25b3747" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-76b0-8f1c-1bf64fd3a324" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b6d4-722e-97a2-e9e5f25b3747" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-722e-97a2-e9e5f25b3747_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b6d4-722e-97a2-e9e5f25b3747" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-722e-97a2-e9e5f25b3747_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-7d21-a315-c4106b31e3de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_019c76d3-b6d4-722e-97a2-e9e5f25b3747" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-7d21-a315-c4106b31e3de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_019c76d3-b6d4-7944-b98d-a783b9c34756" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-7d21-a315-c4106b31e3de" xlink:to="loc_us-gaap_CostOfSalesMember_019c76d3-b6d4-7944-b98d-a783b9c34756" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019c76d3-b6d4-7c36-a8be-25f2482aea37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-7d21-a315-c4106b31e3de" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_019c76d3-b6d4-7c36-a8be-25f2482aea37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_019c76d3-b6d4-72f8-92cd-1a476a36d805" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-7d21-a315-c4106b31e3de" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_019c76d3-b6d4-72f8-92cd-1a476a36d805" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019c76d3-b6d4-769f-965f-80e6560e4326" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_019c76d3-b6d4-7d21-a315-c4106b31e3de" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_019c76d3-b6d4-769f-965f-80e6560e4326" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualAxis_019c76d3-b6d4-7fb2-a39e-20310cdfb079" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-76b0-8f1c-1bf64fd3a324" xlink:to="loc_srt_TitleOfIndividualAxis_019c76d3-b6d4-7fb2-a39e-20310cdfb079" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b6d4-7fb2-a39e-20310cdfb079_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_TitleOfIndividualAxis_019c76d3-b6d4-7fb2-a39e-20310cdfb079" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b6d4-7fb2-a39e-20310cdfb079_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b6d4-736a-a350-88f07c961718" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_TitleOfIndividualWithRelationshipToEntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_TitleOfIndividualAxis_019c76d3-b6d4-7fb2-a39e-20310cdfb079" xlink:to="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b6d4-736a-a350-88f07c961718" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ChiefExecutiveOfficerMember_019c76d3-b6d4-7c32-837c-cfece15bc598" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ChiefExecutiveOfficerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_TitleOfIndividualWithRelationshipToEntityDomain_019c76d3-b6d4-736a-a350-88f07c961718" xlink:to="loc_srt_ChiefExecutiveOfficerMember_019c76d3-b6d4-7c32-837c-cfece15bc598" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7e0c-9f6c-8d5ebe7b58a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019c76d3-b6d4-76b0-8f1c-1bf64fd3a324" xlink:to="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7e0c-9f6c-8d5ebe7b58a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7e0c-9f6c-8d5ebe7b58a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7e0c-9f6c-8d5ebe7b58a3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-7e0c-9f6c-8d5ebe7b58a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-75cd-a331-2e89eea5c0bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019c76d3-b6d4-7e0c-9f6c-8d5ebe7b58a3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-75cd-a331-2e89eea5c0bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-702e-8383-1499cecedb12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019c76d3-b6d4-75cd-a331-2e89eea5c0bc" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-702e-8383-1499cecedb12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c76d3-b6d4-75ac-b781-04493c50bd7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019c76d3-b6d4-7182-90a8-2109e08ad633" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_019c76d3-b6d4-75ac-b781-04493c50bd7f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7e5e-a4f4-779943b158a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-799b-9b93-55af5f0a4d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7e5e-a4f4-779943b158a5" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-799b-9b93-55af5f0a4d8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_019c76d3-b6d4-75fe-a8fc-cafd9aa5c06e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-799b-9b93-55af5f0a4d8d" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_019c76d3-b6d4-75fe-a8fc-cafd9aa5c06e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019c76d3-b6d4-75fe-a8fc-cafd9aa5c06e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019c76d3-b6d4-75fe-a8fc-cafd9aa5c06e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019c76d3-b6d4-75fe-a8fc-cafd9aa5c06e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019c76d3-b6d4-7333-a753-3d65d9d268a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019c76d3-b6d4-75fe-a8fc-cafd9aa5c06e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019c76d3-b6d4-7333-a753-3d65d9d268a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_019c76d3-b6d4-755e-9c1e-17e813c7753b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_019c76d3-b6d4-7333-a753-3d65d9d268a2" xlink:to="loc_us-gaap_DomesticCountryMember_019c76d3-b6d4-755e-9c1e-17e813c7753b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_019c76d3-b6d4-7847-87f5-c7dc248ecec2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_019c76d3-b6d4-7333-a753-3d65d9d268a2" xlink:to="loc_us-gaap_ForeignCountryMember_019c76d3-b6d4-7847-87f5-c7dc248ecec2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_019c76d3-b6d4-7378-960a-b8d4b4fa791f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_019c76d3-b6d4-7333-a753-3d65d9d268a2" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_019c76d3-b6d4-7378-960a-b8d4b4fa791f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7aad-b99f-fb65450b096c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-799b-9b93-55af5f0a4d8d" xlink:to="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7aad-b99f-fb65450b096c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7aad-b99f-fb65450b096c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7aad-b99f-fb65450b096c" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7aad-b99f-fb65450b096c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7c3d-ba0c-b52c50d3ad9c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7aad-b99f-fb65450b096c" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7c3d-ba0c-b52c50d3ad9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_019c76d3-b6d4-75dd-8d92-45fd656da939" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7c3d-ba0c-b52c50d3ad9c" xlink:to="loc_country_IL_019c76d3-b6d4-75dd-8d92-45fd656da939" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019c76d3-b6d4-79eb-9aa2-766a87a43e23" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7c3d-ba0c-b52c50d3ad9c" xlink:to="loc_country_US_019c76d3-b6d4-79eb-9aa2-766a87a43e23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ExpirationPeriodAxis_019c76d3-b6d4-709f-82b2-10557a09857b" xlink:href="rskd-20251231.xsd#rskd_ExpirationPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-799b-9b93-55af5f0a4d8d" xlink:to="loc_rskd_ExpirationPeriodAxis_019c76d3-b6d4-709f-82b2-10557a09857b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ExpirationPeriodDomain_019c76d3-b6d4-709f-82b2-10557a09857b_default" xlink:href="rskd-20251231.xsd#rskd_ExpirationPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_rskd_ExpirationPeriodAxis_019c76d3-b6d4-709f-82b2-10557a09857b" xlink:to="loc_rskd_ExpirationPeriodDomain_019c76d3-b6d4-709f-82b2-10557a09857b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ExpirationPeriodDomain_019c76d3-b6d4-74f8-8389-92469cb50636" xlink:href="rskd-20251231.xsd#rskd_ExpirationPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_rskd_ExpirationPeriodAxis_019c76d3-b6d4-709f-82b2-10557a09857b" xlink:to="loc_rskd_ExpirationPeriodDomain_019c76d3-b6d4-74f8-8389-92469cb50636" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_TaxYear2042Member_019c76d3-b6d4-7fb8-a0bd-0f05a8f09a5c" xlink:href="rskd-20251231.xsd#rskd_TaxYear2042Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rskd_ExpirationPeriodDomain_019c76d3-b6d4-74f8-8389-92469cb50636" xlink:to="loc_rskd_TaxYear2042Member_019c76d3-b6d4-7fb8-a0bd-0f05a8f09a5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LatestTaxYearMember_019c76d3-b6d4-7f05-89d9-2ec5953d932c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LatestTaxYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_rskd_ExpirationPeriodDomain_019c76d3-b6d4-74f8-8389-92469cb50636" xlink:to="loc_us-gaap_LatestTaxYearMember_019c76d3-b6d4-7f05-89d9-2ec5953d932c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c76d3-b6d4-799b-bfdb-525e212980fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7e5e-a4f4-779943b158a5" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019c76d3-b6d4-799b-bfdb-525e212980fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_019c76d3-b6d4-7498-9578-8ec41b3fa496" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7e5e-a4f4-779943b158a5" xlink:to="loc_us-gaap_OperatingLossCarryforwards_019c76d3-b6d4-7498-9578-8ec41b3fa496" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_019c76d3-b6d4-7bfe-bb18-b981b8979069" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7e5e-a4f4-779943b158a5" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_019c76d3-b6d4-7bfe-bb18-b981b8979069" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_019c76d3-b6d4-722b-87ff-63b38269b5a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7e5e-a4f4-779943b158a5" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_019c76d3-b6d4-722b-87ff-63b38269b5a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_019c76d3-b6d4-7271-875c-27503f543019" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7e5e-a4f4-779943b158a5" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_019c76d3-b6d4-7271-875c-27503f543019" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/IncomeTaxesScheduleofProfitLossbeforeProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#IncomeTaxesScheduleofProfitLossbeforeProvisionforIncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/IncomeTaxesScheduleofProfitLossbeforeProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7369-bc8f-54d2afcfe2be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-7308-be31-5cbdc06c2d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7369-bc8f-54d2afcfe2be" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-7308-be31-5cbdc06c2d8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7637-8e5f-89fb135a2985" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-7308-be31-5cbdc06c2d8d" xlink:to="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7637-8e5f-89fb135a2985" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7637-8e5f-89fb135a2985_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7637-8e5f-89fb135a2985" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7637-8e5f-89fb135a2985_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7d66-8214-5a68d47a5991" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7637-8e5f-89fb135a2985" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7d66-8214-5a68d47a5991" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_019c76d3-b6d4-7b1b-81ec-cb90f98d443e" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7d66-8214-5a68d47a5991" xlink:to="loc_country_IL_019c76d3-b6d4-7b1b-81ec-cb90f98d443e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_NonIsraelMember_019c76d3-b6d4-705b-a4fd-e88cec00e3ed" xlink:href="rskd-20251231.xsd#rskd_NonIsraelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7d66-8214-5a68d47a5991" xlink:to="loc_rskd_NonIsraelMember_019c76d3-b6d4-705b-a4fd-e88cec00e3ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c76d3-b6d4-7631-82c5-18064a117e3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7369-bc8f-54d2afcfe2be" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019c76d3-b6d4-7631-82c5-18064a117e3e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/IncomeTaxesScheduleofProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#IncomeTaxesScheduleofProvisionforIncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/IncomeTaxesScheduleofProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_019c76d3-b6d4-753d-8f32-c2aa0a4f0d91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_019c76d3-b6d4-7c65-ae92-8c47b51ede3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c76d3-b6d4-753d-8f32-c2aa0a4f0d91" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_019c76d3-b6d4-7c65-ae92-8c47b51ede3f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7626-ab0f-8f85e5d3fa87" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_019c76d3-b6d4-7c65-ae92-8c47b51ede3f" xlink:to="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7626-ab0f-8f85e5d3fa87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7626-ab0f-8f85e5d3fa87_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7626-ab0f-8f85e5d3fa87" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7626-ab0f-8f85e5d3fa87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7b11-9397-99ac15cd346b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019c76d3-b6d4-7626-ab0f-8f85e5d3fa87" xlink:to="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7b11-9397-99ac15cd346b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IL_019c76d3-b6d4-75ec-8cec-0a20d28910c5" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7b11-9397-99ac15cd346b" xlink:to="loc_country_IL_019c76d3-b6d4-75ec-8cec-0a20d28910c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_NonIsraelMember_019c76d3-b6d4-7700-8d2f-cfcfd45a3f22" xlink:href="rskd-20251231.xsd#rskd_NonIsraelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019c76d3-b6d4-7b11-9397-99ac15cd346b" xlink:to="loc_rskd_NonIsraelMember_019c76d3-b6d4-7700-8d2f-cfcfd45a3f22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_019c76d3-b6d4-748a-b078-a7291005a70f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c76d3-b6d4-753d-8f32-c2aa0a4f0d91" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_019c76d3-b6d4-748a-b078-a7291005a70f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019c76d3-b6d4-7cae-939e-776ca40b66ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c76d3-b6d4-753d-8f32-c2aa0a4f0d91" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_019c76d3-b6d4-7cae-939e-776ca40b66ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019c76d3-b6d4-7749-be91-2868ff94ef7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_019c76d3-b6d4-753d-8f32-c2aa0a4f0d91" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019c76d3-b6d4-7749-be91-2868ff94ef7a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/IncomeTaxesReconciliationofEffectiveIncomeTaxProvisionDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#IncomeTaxesReconciliationofEffectiveIncomeTaxProvisionDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/IncomeTaxesReconciliationofEffectiveIncomeTaxProvisionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7b46-9903-dcad03e68cdf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-7384-894b-aeb7cbd70aca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7b46-9903-dcad03e68cdf" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-7384-894b-aeb7cbd70aca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_019ca071-2f90-7b8c-b6ec-e8cec7552acf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_019c76d3-b6d4-7384-894b-aeb7cbd70aca" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_019ca071-2f90-7b8c-b6ec-e8cec7552acf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019ca071-2f90-7b8c-b6ec-e8cec7552acf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019ca071-2f90-7b8c-b6ec-e8cec7552acf" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019ca071-2f90-7b8c-b6ec-e8cec7552acf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019ca071-62cb-7519-8496-55b5cc95dbfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019ca071-2f90-7b8c-b6ec-e8cec7552acf" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019ca071-62cb-7519-8496-55b5cc95dbfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_019ca071-930e-728e-a201-8db627248947" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_019ca071-62cb-7519-8496-55b5cc95dbfa" xlink:to="loc_us-gaap_ForeignCountryMember_019ca071-930e-728e-a201-8db627248947" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019ca071-d74c-7cbb-81da-8a6f0ff933ed" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ca071-930e-728e-a201-8db627248947" xlink:to="loc_country_US_019ca071-d74c-7cbb-81da-8a6f0ff933ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignTaxJurisdictionOtherMember_019ca072-5c61-775a-982f-aa2747cca4eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignTaxJurisdictionOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ca071-930e-728e-a201-8db627248947" xlink:to="loc_us-gaap_ForeignTaxJurisdictionOtherMember_019ca072-5c61-775a-982f-aa2747cca4eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7b46-9903-dcad03e68cdf" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_019c76d3-b6d4-775a-ac00-f01d0998eeeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate_019c76d3-b6d4-775a-ac00-f01d0998eeeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_019ca070-b4c8-760a-bcd5-15ce199c99b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential_019ca070-b4c8-760a-bcd5-15ce199c99b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_019ca080-0ff6-7e73-88ac-293cfd56c5e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes_019ca080-0ff6-7e73-88ac-293cfd56c5e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_019ca074-c70b-78d4-abc5-871bdea73fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationOtherAdjustments_019ca074-c70b-78d4-abc5-871bdea73fa6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_019ca073-f7fa-7b7c-8d6c-1155ea08beb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance_019ca073-f7fa-7b7c-8d6c-1155ea08beb1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_019ca074-32ed-75ed-91a8-63ce95026411" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost_019ca074-32ed-75ed-91a8-63ce95026411" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_019ca074-7e1d-7304-bb6b-c50cb3d3b70c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationTaxContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationTaxContingencies_019ca074-7e1d-7304-bb6b-c50cb3d3b70c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_EffectiveIncomeTaxRateReconciliationPreferredEnterpriseAmount_019c76d3-b6d4-7bd8-96a0-b8be8c537b25" xlink:href="rskd-20251231.xsd#rskd_EffectiveIncomeTaxRateReconciliationPreferredEnterpriseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_rskd_EffectiveIncomeTaxRateReconciliationPreferredEnterpriseAmount_019c76d3-b6d4-7bd8-96a0-b8be8c537b25" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes_019c76d3-b6d4-7744-9140-627fc1f8a0cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes_019c76d3-b6d4-7744-9140-627fc1f8a0cf" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_019c76d3-b6d4-77d5-9178-775f354c5122" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxReconciliationNondeductibleExpenseOther_019c76d3-b6d4-77d5-9178-775f354c5122" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019c76d3-b6d4-725b-8259-c9e7e1e7f6d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract_019ca079-a913-7356-96e7-889ebd1ef4a8" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019c76d3-b6d4-725b-8259-c9e7e1e7f6d1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_019c76d3-b6d4-7b46-9903-dcad03e68cdf" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019ca07c-07a8-7020-8b85-783ea4ca5dea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_019ca07c-07a8-7020-8b85-783ea4ca5dea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019ca07c-35ea-77b5-9872-68d8078ed91b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_019ca07c-35ea-77b5-9872-68d8078ed91b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019ca07f-a1ab-7f34-b335-78f6190685ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_019ca07f-a1ab-7f34-b335-78f6190685ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019ca07c-73f9-7968-b317-7cdc01ae64e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_019ca07c-73f9-7968-b317-7cdc01ae64e6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_019ca07c-9fea-7d9b-ace1-05ef82c725df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_019ca07c-9fea-7d9b-ace1-05ef82c725df" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_019ca07c-dfef-77a2-94ad-c8d9e1fd907a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_019ca07c-dfef-77a2-94ad-c8d9e1fd907a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_019ca07d-157c-74d1-818a-d023dbcd6ca4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_019ca07d-157c-74d1-818a-d023dbcd6ca4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_EffectiveIncomeTaxRateReconciliationPreferredEnterprisePercent_019ca07d-af00-7220-b825-d4e716d12219" xlink:href="rskd-20251231.xsd#rskd_EffectiveIncomeTaxRateReconciliationPreferredEnterprisePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_rskd_EffectiveIncomeTaxRateReconciliationPreferredEnterprisePercent_019ca07d-af00-7220-b825-d4e716d12219" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c76d3-b6d4-79bc-8d24-51ee856edae4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_019ca07a-1f86-70b1-9fd9-8ab0d2ac7803" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_019c76d3-b6d4-79bc-8d24-51ee856edae4" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/IncomeTaxesScheduleofIncomeTaxesPaidNetDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#IncomeTaxesScheduleofIncomeTaxesPaidNetDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/IncomeTaxesScheduleofIncomeTaxesPaidNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ca06a-800e-7e3c-bae9-070a74e8a5b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionTable_019ca06a-5a2f-77ac-b29c-6744f1bcccfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidByIndividualJurisdictionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ca06a-800e-7e3c-bae9-070a74e8a5b1" xlink:to="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionTable_019ca06a-5a2f-77ac-b29c-6744f1bcccfd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_019ca06a-dd7a-7738-a4da-2072ef290cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionTable_019ca06a-5a2f-77ac-b29c-6744f1bcccfd" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_019ca06a-dd7a-7738-a4da-2072ef290cc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019ca06a-dd7a-7738-a4da-2072ef290cc9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019ca06a-dd7a-7738-a4da-2072ef290cc9" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019ca06a-dd7a-7738-a4da-2072ef290cc9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_019ca06b-030c-71ad-9abe-f4e82809b96c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_019ca06a-dd7a-7738-a4da-2072ef290cc9" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_019ca06b-030c-71ad-9abe-f4e82809b96c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_019ca06d-4d01-7682-9633-e1bb2bdef39c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_019ca06b-030c-71ad-9abe-f4e82809b96c" xlink:to="loc_us-gaap_ForeignCountryMember_019ca06d-4d01-7682-9633-e1bb2bdef39c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019ca06d-6c50-72a4-aeea-2ac6c7d31826" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ca06d-4d01-7682-9633-e1bb2bdef39c" xlink:to="loc_country_US_019ca06d-6c50-72a4-aeea-2ac6c7d31826" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_JP_019ca06d-8abd-7739-870b-4fa9fb696e62" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_JP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ca06d-4d01-7682-9633-e1bb2bdef39c" xlink:to="loc_country_JP_019ca06d-8abd-7739-870b-4fa9fb696e62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019ca06d-b0a1-7d4b-93e8-8a690a5aa642" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ForeignCountryMember_019ca06d-4d01-7682-9633-e1bb2bdef39c" xlink:to="loc_country_CN_019ca06d-b0a1-7d4b-93e8-8a690a5aa642" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019ca06c-1595-7438-8188-9af18e9c3c3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidFederalAfterRefundReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ca06a-800e-7e3c-bae9-070a74e8a5b1" xlink:to="loc_us-gaap_IncomeTaxPaidFederalAfterRefundReceived_019ca06c-1595-7438-8188-9af18e9c3c3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019ca06b-3b75-7a6c-9d44-02a9e38d5605" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxPaidForeignAfterRefundReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ca06a-800e-7e3c-bae9-070a74e8a5b1" xlink:to="loc_us-gaap_IncomeTaxPaidForeignAfterRefundReceived_019ca06b-3b75-7a6c-9d44-02a9e38d5605" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_019ca06c-4aa2-7993-aca4-af9ac6465c44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxPaidByIndividualJurisdictionLineItems_019ca06a-800e-7e3c-bae9-070a74e8a5b1" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_019ca06c-4aa2-7993-aca4-af9ac6465c44" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/NetProfitLossPerShareAttributabletoOrdinaryShareholdersScheduleofEarningsPerShareDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#NetProfitLossPerShareAttributabletoOrdinaryShareholdersScheduleofEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/NetProfitLossPerShareAttributabletoOrdinaryShareholdersScheduleofEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c76d3-b6d4-74e5-a8bc-0ebda7af9968" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c76d3-b6d4-74e5-a8bc-0ebda7af9968" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-765a-8069-1a448c0212a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c76d3-b6d4-74e5-a8bc-0ebda7af9968" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-765a-8069-1a448c0212a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-765a-8069-1a448c0212a1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-765a-8069-1a448c0212a1" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-765a-8069-1a448c0212a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7418-9988-422d1e60a73a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-765a-8069-1a448c0212a1" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7418-9988-422d1e60a73a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b6d4-7bdf-ab32-e8801129804c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7418-9988-422d1e60a73a" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b6d4-7bdf-ab32-e8801129804c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b6d4-7c31-a836-b7b1c8a9e2f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7418-9988-422d1e60a73a" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b6d4-7c31-a836-b7b1c8a9e2f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019c76d3-b6d4-71a1-b4c6-f39a8ba7bcf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019c76d3-b6d4-71a1-b4c6-f39a8ba7bcf1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019c76d3-b6d4-7398-b6f1-02e870d490f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted_019c76d3-b6d4-7398-b6f1-02e870d490f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c76d3-b6d4-709f-bfbc-075898e69ce4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019c76d3-b6d4-709f-bfbc-075898e69ce4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c76d3-b6d4-704f-9aec-ce164d1f2c0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c76d3-b6d4-704f-9aec-ce164d1f2c0b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019c76d3-b6d4-7ba8-9de9-f46ccf3ec0e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:to="loc_us-gaap_EarningsPerShareBasic_019c76d3-b6d4-7ba8-9de9-f46ccf3ec0e5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019c76d3-b6d4-7a3a-9150-854b7fda2cb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-7041-ad2f-bb94444a587b" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019c76d3-b6d4-7a3a-9150-854b7fda2cb5" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/NetProfitLossPerShareAttributabletoOrdinaryShareholdersScheduleofAntiDilutiveSecuritiesDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#NetProfitLossPerShareAttributabletoOrdinaryShareholdersScheduleofAntiDilutiveSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/NetProfitLossPerShareAttributabletoOrdinaryShareholdersScheduleofAntiDilutiveSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c76d3-b6d4-7f0c-8ce1-fcf0f6868317" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c76d3-b6d4-7558-a878-927fdede48fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c76d3-b6d4-7f0c-8ce1-fcf0f6868317" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c76d3-b6d4-7558-a878-927fdede48fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c76d3-b6d4-7a01-aa2c-432702b4ca17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c76d3-b6d4-7558-a878-927fdede48fb" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c76d3-b6d4-7a01-aa2c-432702b4ca17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7a01-aa2c-432702b4ca17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c76d3-b6d4-7a01-aa2c-432702b4ca17" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7a01-aa2c-432702b4ca17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7ab1-b28b-0df5988bad3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019c76d3-b6d4-7a01-aa2c-432702b4ca17" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7ab1-b28b-0df5988bad3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertiblePreferredStockMember_019c76d3-b6d4-71b6-ac80-cabb0aa72599" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7ab1-b28b-0df5988bad3e" xlink:to="loc_us-gaap_ConvertiblePreferredStockMember_019c76d3-b6d4-71b6-ac80-cabb0aa72599" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_019c76d3-b6d4-7c5e-b46b-dc5eaed04878" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7ab1-b28b-0df5988bad3e" xlink:to="loc_us-gaap_WarrantMember_019c76d3-b6d4-7c5e-b46b-dc5eaed04878" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_019c76d3-b6d4-7a43-bdfc-9e496fc760b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7ab1-b28b-0df5988bad3e" xlink:to="loc_us-gaap_StockCompensationPlanMember_019c76d3-b6d4-7a43-bdfc-9e496fc760b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-744b-ba1c-3e44a503f07f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019c76d3-b6d4-7ab1-b28b-0df5988bad3e" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_019c76d3-b6d4-744b-ba1c-3e44a503f07f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-78b6-9c3d-12877ba4c8dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_019c76d3-b6d4-7558-a878-927fdede48fb" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-78b6-9c3d-12877ba4c8dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-78b6-9c3d-12877ba4c8dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-78b6-9c3d-12877ba4c8dc" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-78b6-9c3d-12877ba4c8dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7b5c-943d-fa22d0c378a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-78b6-9c3d-12877ba4c8dc" xlink:to="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7b5c-943d-fa22d0c378a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_019c76d3-b6d4-74c0-9e26-9c6490bcd4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7b5c-943d-fa22d0c378a6" xlink:to="loc_us-gaap_CommonClassAMember_019c76d3-b6d4-74c0-9e26-9c6490bcd4b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b6d4-744e-a695-3c8afbac3c32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7b5c-943d-fa22d0c378a6" xlink:to="loc_us-gaap_CommonClassBMember_019c76d3-b6d4-744e-a695-3c8afbac3c32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c76d3-b6d4-7d1c-84dc-73b14b83aca4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_019c76d3-b6d4-7f0c-8ce1-fcf0f6868317" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019c76d3-b6d4-7d1c-84dc-73b14b83aca4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-725b-a856-451771648270" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c76d3-b6d4-7b81-af8a-ec98d67b9ca8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-725b-a856-451771648270" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c76d3-b6d4-7b81-af8a-ec98d67b9ca8" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-7f9d-bc0b-69c6ba7caf23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019c76d3-b6d4-7b81-af8a-ec98d67b9ca8" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019c76d3-b6d4-7f9d-bc0b-69c6ba7caf23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-7f9d-bc0b-69c6ba7caf23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019c76d3-b6d4-71a9-8491-e6bfd6f7abd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_019c76d3-b6d4-7fba-a0a4-90d2e6526c21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonClassBMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c76d3-b6d4-7249-b586-c4c7c0e20794" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019c76d3-b6d4-725b-a856-451771648270" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019c76d3-b6d4-7249-b586-c4c7c0e20794" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ca058-92de-75e5-9a0b-962b6f9daf28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ca058-3c24-73d4-b68b-1413da5fc995" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ca058-92de-75e5-9a0b-962b6f9daf28" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ca058-3c24-73d4-b68b-1413da5fc995" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019ca059-602a-7751-af58-d56ad4b83c23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ca058-3c24-73d4-b68b-1413da5fc995" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019ca059-602a-7751-af58-d56ad4b83c23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019ca059-602a-7751-af58-d56ad4b83c23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019ca059-602a-7751-af58-d56ad4b83c23" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019ca059-602a-7751-af58-d56ad4b83c23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019ca059-8b84-70a4-bd6f-7fe77aeb5db2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019ca059-602a-7751-af58-d56ad4b83c23" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019ca059-8b84-70a4-bd6f-7fe77aeb5db2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareRepurchaseAgreementMember_019ca05a-754d-7e96-9a3f-39ae5a29c826" xlink:href="rskd-20251231.xsd#rskd_ShareRepurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019ca059-8b84-70a4-bd6f-7fe77aeb5db2" xlink:to="loc_rskd_ShareRepurchaseAgreementMember_019ca05a-754d-7e96-9a3f-39ae5a29c826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_RelatedPartyTransactionSharesToBeRepurchased_019ca05d-0fda-77c4-9ad9-332edac5edb8" xlink:href="rskd-20251231.xsd#rskd_RelatedPartyTransactionSharesToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ca058-92de-75e5-9a0b-962b6f9daf28" xlink:to="loc_rskd_RelatedPartyTransactionSharesToBeRepurchased_019ca05d-0fda-77c4-9ad9-332edac5edb8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_RelatedPartyTransactionRepurchasePriceOfSharesToBeRepurchased_019ca05d-c106-75f2-9d25-e4cf2659512f" xlink:href="rskd-20251231.xsd#rskd_RelatedPartyTransactionRepurchasePriceOfSharesToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ca058-92de-75e5-9a0b-962b6f9daf28" xlink:to="loc_rskd_RelatedPartyTransactionRepurchasePriceOfSharesToBeRepurchased_019ca05d-c106-75f2-9d25-e4cf2659512f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019ca05b-6faa-766b-9ccb-d88ffdd07733" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAmountsOfTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ca058-92de-75e5-9a0b-962b6f9daf28" xlink:to="loc_us-gaap_RelatedPartyTransactionAmountsOfTransaction_019ca05b-6faa-766b-9ccb-d88ffdd07733" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/SubsequentEventsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#SubsequentEventsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/SubsequentEventsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019c76d3-b6d4-7678-aba0-9754e8c9d589" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019c76d3-b6d4-7ccc-9e35-f9729da878f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c76d3-b6d4-7678-aba0-9754e8c9d589" xlink:to="loc_us-gaap_SubsequentEventTable_019c76d3-b6d4-7ccc-9e35-f9729da878f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019cbe7a-4273-79e0-b055-0d1e56da487b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c76d3-b6d4-7ccc-9e35-f9729da878f4" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019cbe7a-4273-79e0-b055-0d1e56da487b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cbe7a-4273-79e0-b055-0d1e56da487b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cbe7a-4273-79e0-b055-0d1e56da487b" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cbe7a-4273-79e0-b055-0d1e56da487b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019cbe7a-6817-71e5-9578-90de518cc7a1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019cbe7a-4273-79e0-b055-0d1e56da487b" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019cbe7a-6817-71e5-9578-90de518cc7a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareRepurchaseProgramMember_019cbe7a-920d-7b32-bfc7-709feed762b0" xlink:href="rskd-20251231.xsd#rskd_ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019cbe7a-6817-71e5-9578-90de518cc7a1" xlink:to="loc_rskd_ShareRepurchaseProgramMember_019cbe7a-920d-7b32-bfc7-709feed762b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019c76d3-b6d4-7135-902a-c0fd24ab922b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019c76d3-b6d4-7ccc-9e35-f9729da878f4" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019c76d3-b6d4-7135-902a-c0fd24ab922b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c76d3-b6d4-7135-902a-c0fd24ab922b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c76d3-b6d4-7135-902a-c0fd24ab922b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c76d3-b6d4-7135-902a-c0fd24ab922b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019c76d3-b6d4-77dc-89df-fb4528163f6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019c76d3-b6d4-7135-902a-c0fd24ab922b" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019c76d3-b6d4-77dc-89df-fb4528163f6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019c76d3-b6d4-73f6-af89-a81d05d9c994" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019c76d3-b6d4-77dc-89df-fb4528163f6e" xlink:to="loc_us-gaap_SubsequentEventMember_019c76d3-b6d4-73f6-af89-a81d05d9c994" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ShareRepurchasedProgramAdditionalAuthorizationAmount_019cbe54-cbe7-7d3e-9653-8e337d3a39e4" xlink:href="rskd-20251231.xsd#rskd_ShareRepurchasedProgramAdditionalAuthorizationAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c76d3-b6d4-7678-aba0-9754e8c9d589" xlink:to="loc_rskd_ShareRepurchasedProgramAdditionalAuthorizationAmount_019cbe54-cbe7-7d3e-9653-8e337d3a39e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019cbe53-48d5-7bca-8ead-e60e42372223" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019c76d3-b6d4-7678-aba0-9754e8c9d589" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019cbe53-48d5-7bca-8ead-e60e42372223" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://riskified.com/role/SECScheduleArticle1209ValuationandQualifyingAccountsDetails" xlink:type="simple" xlink:href="rskd-20251231.xsd#SECScheduleArticle1209ValuationandQualifyingAccountsDetails"/>
  <link:definitionLink xlink:role="http://riskified.com/role/SECScheduleArticle1209ValuationandQualifyingAccountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_019c76d3-b6d4-7518-812f-702262ffa4ec" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_019c76d3-b6d4-745c-a3dd-caf016dd541f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ValuationAndQualifyingAccountsDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_019c76d3-b6d4-7518-812f-702262ffa4ec" xlink:to="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_019c76d3-b6d4-745c-a3dd-caf016dd541f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_019c76d3-b6d4-7dcc-91e3-a1d52f18dda8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureTable_019c76d3-b6d4-745c-a3dd-caf016dd541f" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_019c76d3-b6d4-7dcc-91e3-a1d52f18dda8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_019c76d3-b6d4-7dcc-91e3-a1d52f18dda8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_019c76d3-b6d4-7dcc-91e3-a1d52f18dda8" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_019c76d3-b6d4-7dcc-91e3-a1d52f18dda8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_019c76d3-b6d4-76d3-9e8e-5f93cc661993" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_019c76d3-b6d4-7dcc-91e3-a1d52f18dda8" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_019c76d3-b6d4-76d3-9e8e-5f93cc661993" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantyReservesMember_019c76d3-b6d4-74c4-8102-d40129eee770" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WarrantyReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_019c76d3-b6d4-76d3-9e8e-5f93cc661993" xlink:to="loc_us-gaap_WarrantyReservesMember_019c76d3-b6d4-74c4-8102-d40129eee770" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_ProvisionForChargebacksMember_019c76d3-b6d4-79fb-a7a0-811be7a9a0f1" xlink:href="rskd-20251231.xsd#rskd_ProvisionForChargebacksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_019c76d3-b6d4-76d3-9e8e-5f93cc661993" xlink:to="loc_rskd_ProvisionForChargebacksMember_019c76d3-b6d4-79fb-a7a0-811be7a9a0f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_019c76d3-b6d4-7ef9-b178-8f847d4b0298" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInValuationAllowancesAndReservesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ValuationAndQualifyingAccountsDisclosureLineItems_019c76d3-b6d4-7518-812f-702262ffa4ec" xlink:to="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_019c76d3-b6d4-7ef9-b178-8f847d4b0298" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_019c76d3-b6d4-74a5-9457-19f9a9594f7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_019c76d3-b6d4-7ef9-b178-8f847d4b0298" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_019c76d3-b6d4-74a5-9457-19f9a9594f7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_019c76d3-b6d4-711e-b8ae-4a8e5fe8e82a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_019c76d3-b6d4-7ef9-b178-8f847d4b0298" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_019c76d3-b6d4-711e-b8ae-4a8e5fe8e82a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_019c76d3-b6d4-7380-bc80-cdb33a051a6a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesDeductions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInValuationAllowancesAndReservesRollForward_019c76d3-b6d4-7ef9-b178-8f847d4b0298" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_019c76d3-b6d4-7380-bc80-cdb33a051a6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_019c76d3-b6d4-7fef-9f6c-b31332c17e4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationAllowancesAndReservesBalance"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.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_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_rskd_AccruedLiabilitiesAndOtherLiabilitiesCurrent_019c76d3-b3e9-773d-bb15-e53fa8b61579" xlink:href="rskd-20251231.xsd#rskd_AccruedLiabilitiesAndOtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_rskd_AccruedLiabilitiesAndOtherLiabilitiesCurrent_019c76d3-b3e9-773d-bb15-e53fa8b61579" xlink:type="arc" order="31"/>
  </link:definitionLink>
</link:linkbase>
