Etymology
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coition (n.)

1540s, "a going together, a coming together," from Late Latin coitionem (nominative coitio) "a coming together, a meeting; copulation," noun of action from coitus, past participle of coire "to go together, come together" (see coitus). Sexual meaning "copulation" is attested in English from 1610s (coiture in the same sense is from 1570s).

updated on January 17, 2018

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Definitions of coition from WordNet

coition (n.)
sexual activity between individuals, especially the insertion of a man's penis into a woman's vagina until orgasm and ejaculation occur;
Synonyms: sexual intercourse / intercourse / sex act / copulation / coitus / sexual congress / sexual relation / relation / carnal knowledge
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.