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delusion

[ dih-loo-zhuhn ]
/ dɪˈlu ʒən /
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See synonyms for: delusion / delusions on Thesaurus.com

noun
an act or instance of deluding.
the state of being deluded.
a false belief or opinion: delusions of grandeur.
Psychiatry. a fixed false belief that is resistant to reason or confrontation with actual fact: a paranoid delusion.
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Origin of delusion

First recorded in 1375–1425; late Middle English, from Latin dēlūsiōn- (stem of dēlūsiō ), equivalent to dēlūs(us) (past participle of dēlūdere; see delude) + -iōn- -ion

synonym study for delusion

1. See illusion.

OTHER WORDS FROM delusion

de·lu·sion·al, de·lu·sion·ar·y, adjectivepre·de·lu·sion, noun

WORDS THAT MAY BE CONFUSED WITH delusion

delusion , hallucination, illusion (see synonym study at illusion)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use delusion in a sentence

British Dictionary definitions for delusion

delusion
/ (dɪˈluːʒən) /

noun
a mistaken or misleading opinion, idea, belief, etche has delusions of grandeur
psychiatry a belief held in the face of evidence to the contrary, that is resistant to all reasonSee also illusion, hallucination
the act of deluding or state of being deluded

Derived forms of delusion

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for delusion

delusion
[ dĭ-lōōzhən ]

n.
A false belief strongly held in spite of invalidating evidence, especially as a symptom of mental illness.

Other words from delusion

de•lusion•al adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for delusion

delusion
[ dĭ-lōōzhən ]

A false belief or perception strongly held in spite of invalidating evidence, especially as a symptom of mental illness, as in schizophrenia.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Cultural definitions for delusion

delusion

A false belief held despite strong evidence against it; self-deception. Delusions are common in some forms of psychosis. Because of his delusions, the literary character Don Quixote attacks a windmill, thinking it is a giant.

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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