Definition of delusion

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< deluge

delusive >

de·lu·sion    (d-lzhn) KEY 

NOUN:

1. 1. The act or process of deluding.
   2. The state of being deluded.
2. A false belief or opinion: labored under the delusion that success was at hand.
3. Psychiatry A false belief strongly held in spite of invalidating evidence, especially as a symptom of mental illness: delusions of persecution.

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ETYMOLOGY:
Middle English delusioun, from Latin dlsi, dlsin-, from dlsus, past participle of dldere, to delude ; see delude

OTHER FORMS:
de·lusion·al(Adjective)