What does "inmarriage" mean?

Marrying inside one’s own ethnic, religious, or social group.

What is a synonym for "inmarriage"?

Common synonyms include: endogamy, intermarriage.

noun

noun ·Rare ·Advanced level

Noun

1
Marrying inside one’s own ethnic, religious, or social group. countable, uncountable
2
marriage within one's own tribe or group as required by custom or law wordnet

From in- + marriage; compare endogamy.