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illusion

nouncommon in dialogue

  • United Kingdom//ɪˈl(j)uːʒ(ə)n//
  • United Kingdom//ɪˈl(j)uːzj(ə)n//
  • United States/[ɪˈluː.ʒən]/

A distortion of sensory perception where real stimuli lead to a false or misleading impression of reality.

noun

  1. 1

    A distortion of sensory perception where real stimuli lead to a false or misleading impression of reality.

    We saw what looked like a tiger among the trees, but it was an illusion caused by the shadows of the branches.

    Using artificial additives, scientists can create the illusion of fruit flavours in food.

    You realize the sun don't go down it's just an illusion caused by the world spinning round.

  2. 2

    A misapprehension; a belief in something that is in fact not true.

    Jane has this illusion that John is in love with her.

    Now if you feel that you can't go on / Because all of your hope is gone / And your life is filled with much confusion / Until happiness is just an illusion

  3. 3

    A magician’s trick.

  4. 4

    The state of being deceived or misled.

Etymology

From Old French illusion, from Latin illūsiō, from illūdere, from in- (“at, upon”) + lūdere (“to play, mock, trick”). Displaced native Old English dwimmer.

Forms

plural
illusions
The neighbouring pagesAlphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.

Lexical content from Wiktionary, under CC BY-SA 4.0 · Source entry · Data version 2026-08-23

Rank among the words of the OpenSubtitles 2018 corpus — film and television subtitles, so spoken rather than written usage (CC BY-SA 3.0).