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illusion (n.)

mid-14c., "mockery, scorning, derision;" late 14c., "act of deception; deceptive appearance, apparition; delusion of the mind," from Old French illusion "a mocking, deceit, deception" (12c.), from Latin illusionem (nominative illusio) "a mocking, jesting, jeering; irony," from past-participle stem of illudere "mock at," literally "to play with," from assimilated form of in- "at, upon" (from PIE root *en "in") + ludere "to play" (see ludicrous). Sense of "deceptive appearance" first developed in Church Latin. Related: Illusioned "full of illusions" (1920).

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Definitions of illusion

illusion (n.)
an erroneous mental representation;
Synonyms: semblance
illusion (n.)
something many people believe that is false;
they have the illusion that I am very wealthy
Synonyms: fantasy / phantasy / fancy
illusion (n.)
the act of deluding; deception by creating illusory ideas;
Synonyms: delusion / head game
illusion (n.)
an illusory feat; considered magical by naive observers;
Synonyms: magic trick / conjuring trick / trick / magic / legerdemain / conjuration / thaumaturgy / deception
From wordnet.princeton.edu