optical-illusion

Dictionary.com Unabridged

illusion

[ih-loo-zhuhn]
noun
1.
something that deceives by producing a false or misleading impression of reality.
2.
the state or condition of being deceived; misapprehension.
3.
an instance of being deceived.
4.
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.
5.
a very thin, delicate tulle of silk or nylon having a cobwebbed appearance, for trimmings, veilings, and the like.
6.
Obsolete. the act of deceiving; deception; delusion.

Origin:
1300–50; Middle English < Latin illūsiōn- (stem of illūsiō) irony, mocking, equivalent to illūs(us) past participle of illūdere to mock, ridicule (il- il-1 + lūd- play (see ludicrous) + -tus past participle suffix, with dt > s) + -iōn- -ion

illusioned, adjective

allusion, delusion, elusion, hallucination, illusion (see synonym study at the current entry).


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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To optical-illusion
Collins
World English Dictionary
illusion (ɪˈluːʒən)
 
n
1.  a false appearance or deceptive impression of reality: the mirror gives an illusion of depth
2.  a false or misleading perception or belief; delusion: he has the illusion that he is really clever
3.  psychol See also hallucination a perception that is not true to reality, having been altered subjectively in some way in the mind of the perceiver
4.  a very fine gauze or tulle used for trimmings, veils, etc
 
[C14: from Latin illūsiō deceit, from illūdere; see illude]
 
il'lusionary
 
adj
 
il'lusional
 
adj
 
il'lusioned
 
adj

optical illusion
 
n
1.  an object causing a false visual impression
2.  an instance of deception by such an object

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

illusion
mid-14c., "act of deception," from O.Fr. illusion "a mocking," from L. illusionem (nom. illusio) "a mocking, jesting, irony," from illudere "mock at," lit. "to play with," from in- "at" + ludere "to play" (see ludicrous). Sense of "deceptive appearance" developed in Eng. late 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

illusion il·lu·sion (ĭ-lōō'zhən)
n.

  1. An erroneous perception of reality.

  2. An erroneous concept or belief.

  3. The condition of being deceived by a false perception or belief.

  4. Something, such as a fantastic plan or desire, that causes an erroneous belief or perception.


il·lu'sion·al or il·lu'sion·ar'y (-zhə-něr'ē) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature
FAVORITES
RECENT

;