Etymology
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copulation (n.)

late 14c., copulacioun, "a coupling, joining, uniting," from Latin copulationem (nominative copulatio) "a coupling, joining, connecting," noun of action from past-participle stem of copulare "join together, couple, bind, link, unite," from copula "band, tie, link" (see copulate). Specific sense of "sexual intercourse, coition" is from late 15c., and this became the main sense from 16c.

updated on March 31, 2018

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Definitions of copulation from WordNet

copulation (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 / coitus / coition / sexual congress / sexual relation / relation / carnal knowledge
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.