Lewis Short
cŏĭtĭo (noun F) : coëo. *
* A coming or meeting together, a meeting: prima coitio est acerrima,Ter. Phorm. 2, 2, 32.
* Esp.
* A uniting, banding together.
* In gen. (rare): societatis,Dig. 17, 2, 70.
* Sexual intercourse, coition (post-class. for coitus), Macr. S. 7, 16; Cod. Th. 15, 8, 2; Sol. 49 fin.; Lact. 1, 8, 6.
Charlton T. Lewis, Charles Short, A Latin Dictionary