fixed idea
noun
a persistent or obsessing idea, often delusional, that can, in extreme form, be a symptom of psychosis.
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Origin of fixed idea
First recorded in 1820–30
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for fixed idea
fixed idea
noun
an idea, esp one of an obsessional nature, that is persistently maintained and not subject to changeAlso: idée fixe
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
Medicine definitions for fixed idea
fixed idea
n.
An often unreasonable idea or feeling that persists despite evidence to the contrary or efforts to ignore it; an obsession.idée fixe
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.