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English word coitus comes from Latin coeo
coeo (Latin)
I assemble, meet, come together.. I copulate.. I encounter, come up against.. I join, ally with.. I mass together, ball up, curdle.. I unite, come together as a whole.
coitus (Latin)
A coming or meeting. A joining, combination. Sexual intercourse.
coitus (English)
(formal, or, humorous) Sexual intercourse, especially involving penile-vaginal penetration.