Medical Definition of Delusion
Delusion: A false personal belief that is not subject to reason or contradictory evidence and is not explained by a person's usual cultural and religious concepts (so that, for example, it is not an article of faith). A delusion may be firmly maintained in the face of incontrovertible evidence that it is false. Delusions are a frequent feature of schizophrenia.
Last Editorial Review: 5/13/2016
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