From Longman Dictionary of Contemporary Englishcoitusco‧i‧tus /ˈkəʊətəs, ˈkɔɪtəs $ ˈkoʊ-, ˈkɔɪ-/ noun [uncountable] SEX/HAVE SEX WITH technical the act of having sex SYN sexual intercourse —coital adjective
Examples from the Corpus
coitus• For her, coitus releases progesterone into her system, calming her, but not taking her into sleep.• Presumably the missionary position in coitus would have its dangers.• In the psychosomatic sphere it might cause headaches during or because of coitus or a tendency to nausea whenever coitus was performed.• They specifically described and recommended the use of coitus interruptus and other contraceptive methods in marriage.Origin coitus (1800-1900) Latin past participle of coire, from co- ( → CO-) + ire “to go” 