EXOGAMY
exogamy, intermarriage
(noun) marriage to a person belonging to a tribe or group other than your own as required by custom or law
Source: WordNet® 3.1
Etymology
Noun
exogamy (countable and uncountable, plural exogamies)
marriage to a person belonging to a tribe or group other than one's own as required by custom or law
(biology) the fusion of two unrelated gametes
Synonyms
• (marriage): See also intermarriage
Antonyms
• (marriage): endogamy; see also intermarriage
Source: Wiktionary
Ex*og"a*my, n.
Definition: The custom, or tribal law, which prohibits marriage between
members of the same tribe; marriage outside of the tribe; -- opposed
to endogamy. Lubbock.
Source: Webster’s Unabridged Dictionary 1913 Edition