2. The condition of being deceived by a false perception or belief.
3. Something, such as a fantastic plan or desire, that causes an erroneous belief or perception.
4. Illusionism in art.
5. A fine transparent cloth, used for dresses or trimmings.
[Middle English, from Old French, from Late Latin illsi, illsin-, from Latin, a mocking, irony, from illsus, past participle of illdere, to mock : in-, against; see in-2 + ldere, to play; see leid- in Indo-European roots.]
il·lusion·al, il·lusion·ary(-zh-nr) adj.
il·lusion·less adj.
illusion
top: In a Hering figure, straight horizontal rules appear curved.
bottom: In Gestalt theory boxes, a gray box against a black background appears lighter than the same gray box against a white background.
illusion /lun/ n.1 [C;U] a false impression of reality, fantasy: My 12-year-old daughter is so tall that she gives the illusion of being much older than she really is.2 [C] a mistaken idea: He has this illusion of himself as a great actor.-n. [C] illusionist.