Lewis Short
(adjective) : cāsŭālis, e, casus.
* Casual, fortuitous (post-class. and very rare): condicio,depending upon chance,Cod. Just. 6, 51, 1, § 7.—Adv.: cāsŭālĭter, accidentally, Sid. Ep. 9, 11; Fulg. Myth. 1, 5.
* In gram., relating to or declined with cases: Casuale, ut ab equo: equum,Varr. L. L. 8, § 52, p. 116 Bip.; cf. id. ib. 10, § 18, p. 164 Bip.: formae,Prisc. p. 672 P. al.
Charlton T. Lewis, Charles Short, A Latin Dictionary