exogamy

Definitions of exogamy
1

n marriage to a person belonging to a tribe or group other than your own as required by custom or law

Synonyms:
intermarriage
Antonyms:
endogamy, inmarriage, intermarriage
marriage within one's own tribe or group as required by custom or law
Type of:
marriage, matrimony, spousal relationship, union, wedlock
the state of being a married couple voluntarily joined for life (or until divorce)

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