coitus

co·i·tus   (kō'ĭ-təs, kō-ē'-)    n.  Sexual union between a male and a female involving insertion of the penis into the vagina. [Latin, from past participle of coīre, to copulate : co-, co- + īre, to go, come; see ei- in Indo-European roots.] co'i·tal adj., co'i·tal·ly adv.

Main Entry: co·itus
Pronunciation: 'kO-&t-&s, kO-'Et-
Function: noun
: physical union of male and female genitalia accompanied by rhythmicmovements leading to the ejaculation of semen from the penis into the female reproductive tract; also : INTERCOURSE2 —compare ORGASM —co·ital /-&t-^&l, -'Et-/ adjective —co·ital·ly /-^&l-E/ adverb

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

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co'i·tal adj.