What does "exogamy" mean?

marriage to a person belonging to a tribe or group other than one's own as required by custom or law

How do you pronounce "exogamy"?

Pronounced //ɛksˈɑ.ɡə.mi//.

Common synonyms include: allogamy, external marriage, external union, intermarriage, marital alliance, outgroup marriage.

/ɛksˈɑ.ɡə.mi/ noun

noun ·Rare ·Advanced level

Noun

1
marriage to a person belonging to a tribe or group other than one's own as required by custom or law countable, uncountable
2
marriage to a person belonging to a tribe or group other than your own as required by custom or law wordnet
3
the fusion of two unrelated gametes countable, uncountable

From exo- + -gamy. Coined by British lawyer and ethnologist John Ferguson McLennan in his Studies in Ancient History, page 25.