Illusion is a mistake in perception either for physical reasons (an optical illusion like an impossible figure) or psychological reasons as in hallucination.

Webster Dictionary Meaning

1. Illusion
- An unreal image presented to the bodily or mental vision; a deceptive appearance; a false show; mockery; hallucination.
- Hence: Anything agreeably fascinating and charning; enchantment; witchery; glamour.
- A sensation originated by some external object, but so modified as in any way to lead to an erroneous perception; as when the rolling of a wagon is mistaken for thunder.
- A plain, delicate lace, usually of silk, used for veils, scarfs, dresses, etc.
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