illusio

Latin > English (Lewis & Short)

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.