Some modern writers distinguish between an illusion and hallucination, regarding the former as originating with some external object, and the latter as having no objective occasion whatever. Illusion refers particularly to errors of the sense, delusion to false hopes or deceptions of the mind. An optical deception is an illusion, a false opinion is a delusion.
Origin: F. Illusion, L. Illusio, fr. Illudere, illusum, to illude.
(01 Mar 1998)
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