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.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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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
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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.
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Encyclopedia Britannica
Encyclopedia

illusion

a misrepresentation of a "real" sensory stimulus-that is, an interpretation that contradicts objective "reality" as defined by general agreement. For example, a child who perceives tree branches at night as if they are goblins may be said to be having an illusion. An illusion is distinguished from a hallucination, an experience that seems to originate without an external source of stimulation. Neither experience is necessarily a sign of psychiatric disturbance, and both are regularly and consistently reported by virtually everyone.

Learn more about illusion with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Since a rainbow is an optical illusion, it doesn't have an actual endpoint.
What hurts us is an illusion of knowledge that is empirically false.
He gives you illusion that has the appearance of truth.
The vanishing-edge pool creates the illusion that it could slip from its
  moorings and glide away.
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