LATIN DICTIONARYLexicon Latīnum
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“copulation” in Latin

The English word copulation itself goes back to Latin cōpula, through copulo.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

copulation
coitus: initus. The season of copulation, coitus tempus (general term): admissurae tempus (of quadrupeds): tempus, quo aves coeunt (of birds). The natural desire of copulation, coitus libido: catulitio (of dogs ami wolves): subatio (of swine). The passionate desire, *rabies: coeundi ardor: salacitas.

Quick answer

What is the Latin word for copulation?
The usual Latin words for “copulation” are coeō, ineō, tempus; also cătŭlītĭo, sŭbātĭo, salācitās. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.