See under illusion(def 4).
Words nearby optical illusion
Origin of optical illusion
First recorded in 1785–95
Definition for optical illusion (2 of 2)
[ ih-loo-zhuhn ]
/ ɪˈlu ʒən /
something that deceives by producing a false or misleading impression of reality.
the state or condition of being deceived; misapprehension.
an instance of being deceived.
Psychology. a perception, as of visual stimuli (optical illusion), that represents what is perceived in a way different from the way it is in reality.
a very thin, delicate tulle of silk or nylon having a cobwebbed appearance, for trimmings, veilings, and the like.
Obsolete. the act of deceiving; deception; delusion.
Origin of illusion
SYNONYMS FOR illusion
1 aberration, fantasy, chimera. illusion, hallucination, delusion refer to false perceptions or ideas. An illusion is a false mental image produced by misinterpretation of things that actually exist: A mirage is an illusion produced by reflection of light against the sky. A hallucination is a perception of a thing or quality that has no physical counterpart: Under the influence of LSD, Terry had hallucinations that the living-room floor was rippling. A delusion is a persistent false belief: A paranoiac has delusions of persecution.
OTHER WORDS FROM illusionil·lu·sioned, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
Examples from the Web for optical illusion
British Dictionary definitions for optical illusion (1 of 2)
an object causing a false visual impression
an instance of deception by such an object
British Dictionary definitions for optical illusion (2 of 2)
/ (ɪˈluːʒən) /
a false appearance or deceptive impression of realitythe mirror gives an illusion of depth
a false or misleading perception or belief; delusionhe has the illusion that he is really clever
psychol a perception that is not true to reality, having been altered subjectively in some way in the mind of the perceiverSee also hallucination
a very fine gauze or tulle used for trimmings, veils, etc
Derived forms of illusionillusionary or illusional, adjectiveillusioned, adjective
Word Origin for illusion
C14: from Latin illūsiō deceit, from illūdere; see illude
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 optical illusion
[ ĭ-lōō′zhən ]
An erroneous perception of reality.
An erroneous concept or belief.
The condition of being deceived by a false perception or belief.
Something, such as a fantastic plan or desire, that causes an erroneous belief or perception.
Other words from illusionil•lu′sion•al null adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.