Word Origin & History
copulate
14c., from L. copulatus, pp. of copulare "join together, link, unite," from copula "band, tie, link," from PIE *ko-ap-, from *ko(m)- "together" + *ap- "to take, reach." Originally "to join;" copulation in sense of "to join sexually" is first attested 1483: "Made one flesshe by carnal copulacyon or bodily felawshyp" [Caxton].