il·lu·sion ( -l  zh n)n. 1. a. An erroneous perception of reality. b. An erroneous concept or belief. 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 ill  si , 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·lu sion·al, il·lusion·ar y (-zh-n r ) adj.il·lu sion·less adj. |   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. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Adj. | 1. | illusional - marked by or producing illusion; "illusionary stage effects" unreal - lacking in reality or substance or genuineness; not corresponding to acknowledged facts or criteria; "ghosts and other unreal entities"; "unreal propaganda serving as news" |
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