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WordReference Random House Learner's Dictionary of American English © 2024il•lu•sion /ɪˈluʒən/USA pronunciation n. - something that deceives one by producing a false impression of what is real:[countable]The puddle of water on the dry road ahead was just an optical illusion.
- the state or condition of being deceived or fooled;
false belief in something not true or real:[uncountable]I was under the illusion you really cared for me. - an instance of being deceived or of believing something false:[countable]has no illusions about her chances of getting the job.
il•lu•sion•al, il•lu•sion•ar•y, adj. il•lu•sioned, adj. Compare illusion and delusion, both of which refer to false judgments or ideas. An illusion is a false mental picture of something that really exists:A mirage is an illusion produced by the reflection of light against the sky. In other words, the light really exists, but we interpret what we see incorrectly. A delusion is something that we believe in but for which there is no real basis:He was suffering from delusions from the drug.He had delusions that people were chasing him.See -lud-. WordReference Random House Unabridged Dictionary of American English © 2024il•lu•sion (i lo̅o̅′zhən),USA pronunciation n. - 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.
- Psychologya 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.
- [Obs.]the act of deceiving;
deception;
delusion.
- 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
- Middle English 1300–50
- 1.See corresponding entry in Unabridged 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.
Collins Concise English Dictionary © HarperCollins Publishers:: illusion /ɪˈluːʒən/ n - a false appearance or deceptive impression of reality
- a false or misleading perception or belief; delusion
- a perception that is not true to reality, having been altered subjectively in some way in the mind of the perceiver
See also hallucination
Etymology: 14th Century: from Latin illūsiō deceit, from illūdere; see illudeilˈlusionary, ilˈlusional adj |