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Synonyms
il·lu·sion (ĭ-lōṓzhən)

[Middle English, from Old French, from Late Latin illūsiō, illūsiōn-, from Latin, a mocking, irony, from illūsus past participle of illūdere, to mock, in-, against; see in–2, + lūdere, to play.]

noun 

    1. An erroneous perception of reality.
    2. An erroneous concept or belief.
  1. The condition of being deceived by a false perception or belief.
  2. Something, such as a fantastic plan or desire, that causes an erroneous belief or perception.
  3. Illusionism in art.
  4. A fine transparent cloth, used for dresses or trimmings.

derivatives

il·lúsion·al
adjective
il·lúsion·less
adjective