illūsĭo (inl-), ōnis, f. [illudo],
I a mocking , jeering; irony , a figure of speech, = derisio, insultatio, Cic. de Or. 3, 53, 202; also ap. Quint. 9, 1, 28; cf. id. 8, 6, 54.—
II An illusion , deceit (eccl. Lat.), Vulg. Psa. 37, 7; Isa. 66, 4.
inlūsiō (ill-) ōnis, f LVD-, a mocking, jeering . ...
An Elementary Latin Dictionary