coition

[koh-ish-uh n] /koʊˈɪʃ ən/
noun
1.
coitus.
Origin
1535-45; < Latin coitiōn- (stem of coitiō) a coming together, equivalent to coi- variant stem of coīre to come together (co- co- + īre to go) + -tiōn- -tion
Related forms
coitional, adjective
British Dictionary definitions for coition

coitus

/ˈkəʊɪtəs/
noun
1.
technical terms for sexual intercourse
Derived Forms
coital, adjective
Word Origin
C18 coitus: from Latin: a uniting, from coīre to meet, from īre to go
Word Origin and History for coition
n.

1540s, "going together, coming together," from Late Latin coitionem (nominative coitio), noun of action from coitus, past participle of coire "to go together, come together" (see coitus). Meaning "sexual copulation" is attested in English from 1610s.