jŏcātĭo, ōnis, f. [jocor],
a joking, joke (class.): nunc venio ad jocationes tuas, Cic. Fam. 9, 16, 7; id. Att. 2, 8, 1; Auct. Her. 3, 14, 25.
iocātiō ōnis, f iocor, a joking, joke, jest . ...
An Elementary Latin Dictionary