Definition of Delusion

1. Noun. (psychology) an erroneous belief that is held in the face of evidence to the contrary.

2. Noun. A mistaken or unfounded opinion or idea. "His dreams of vast wealth are a hallucination"
Exact synonyms: Hallucination
Generic synonyms: Misconception
Specialized synonyms: Disorientation, Freak Out
Derivative terms: Delude, Delusional, Hallucinate

3. Noun. The act of deluding; deception by creating illusory ideas.
Exact synonyms: Head Game, Illusion
Generic synonyms: Deceit, Deception, Dissembling, Dissimulation
Derivative terms: Delude, Illusional, Illusionary

Definition of Delusion

1. n. The act of deluding; deception; a misleading of the mind.

Definition of Delusion

1. Noun. A false belief that is resistant to confrontation with actual facts. ¹

2. Noun. The state of being deluded or misled. ¹

3. Noun. That which is falsely or delusively believed or propagated; false belief; error in belief. ¹

¹ Source:

Definition of Delusion

1. the act of deluding [n -S]

Medical Definition of Delusion

1. A false belief, seen most often in psychosis (for example schizophrenia). (27 Sep 1997)

Lexicographical Neighbors of Delusion

delusion (current term)
delusion of control
delusion of grandeur
delusion of negation
delusion of persecution
delusion of reference
delusional parasitosis
delusional powers or abilities
delusions of grandeur

Literary usage of Delusion

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Treatise on the Law of Crimes by William Lawrence Clark, William Lawrence Marshall, Herschel Bouton Lazell (1905)
"Xx Thus, a man is responsible for a homicide notwithstanding lie was laboring under an insane delusion that the deceased was trying to marry his mother, ..."

2. The American Journal of the Medical Sciences by Southern Society for Clinical Investigation (U.S.) (1854)
"delusion that he is a commanding officer' (effect of a dose of COPPER). ... delusion that his head is transparent, and that his nose is transparent' ..."

3. The Works of Jeremy Bentham by Jeremy Bentham, John Bowring (1843)
"The objects of delusion are, to cause men to take an improper end for the ... Amongst the instruments of delusion employed for reconciling the people to the ..."

4. The American Journal of Psychology by Granville Stanley Hall, Edward Bradford Titchener (1893)
"The delusion of melancholia may be monotonous, bnt It does not present the ... In general paralysis the hypochondriacal delusion may be complicated at any ..."

5. A Treatise on Equity Jurisprudence: As Administered in the United States of by John Norton Pomeroy (1882)
"The conveyance or agreement of л monomaniac will bo defeated or set aside if it is the result of his insane delusion.' In Martin v. Gale, Id., 4 Ch. D. 428, ..."

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