exogamy
noun
ex·og·a·my ek-ˈsä-gə-mē 
plural exogamies
: marriage outside of a specific group especially as required by custom or law
exogamous
ek-ˈsä-gə-məs
adjective or exogamic
ˌek-sə-ˈga-mik
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Marriage outside of a specific group especially as required by custom or law is exogamy. Exogamous groups sometimes even specify the group into which members must marry. Such groups are usually defined in terms of kinship rather than in terms of politics or territory. Exogamy is usually characteristic of groups that trace descent through either the maternal or paternal line only.
Example Sentences
Recent Examples on the Web The researchers believe their findings reinforce that women marrying outside their community, called female exogamy, was associated with Bronze Age societies. 
Ashley Strickland, CNN, 29 July 2021
Ashley Strickland, CNN, 29 July 2021 Word History
First Known Use
1865, in the meaning defined above
Medical Definition
exogamy
noun
ex·og·a·my ek-ˈsäg-ə-mē
plural exogamies
1
: marriage outside of a specific group especially as required by custom or law
2
: sexual reproduction between individuals (as of a particular species) that are not closely related