sexual intercourse, especially between a man and a woman.

1705–15; < Latin: a coming together, uniting, sexual intercourse, equivalent to coi- (see coition) + -tus suffix of v. action

coital, adjective
coitally, adverb
postcoital, adjective
postcoitally, adverb
precoital, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coitus or coition (ˈkəʊɪtəs, kəʊˈɪʃən)
technical terms for sexual intercourse
[C18 coitus: from Latin: a uniting, from coīre to meet, from īre to go]
coition or coition
[C18 coitus: from Latin: a uniting, from coīre to meet, from īre to go]
'coital or coition

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"copulation," 1713, scientific L., from coition (1610s) "sexual intercourse" (also in coitu), originally "coming together" (1540s), from L.L. coitionem (nom. coitio), from pp. stem of L. coire, from co- "together" + ire "come, go," from PIE base *ei- "to go." Used in Eng. in general senses of "meeting,
uniting," and also of magnetic force, planetary conjunction, etc., before sexual sense came to predominate.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

coitus co·i·tus (kō'ĭ-təs, kō-ē'-)
Sexual union between a male and a female involving insertion of the penis into the vagina. Also called coition, copulation.

co'i·tal adj.
The American Heritage® Stedman's Medical Dictionary
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