English Lexicon

Illusion

/ɪˈluː.ʒən/
nounCEFR B2 (Upper)Top #3400 frequency
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Comprehensive Definitions & Senses

1 sense
As noun
  1. 1

    A false idea or belief; a deceptive appearance or impression.

    "He was under the illusion that he could easily pass the exam."

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Synonyms (2)

Linguistic Origin & Historical Etymology

Derived from the Latin word 'illusio', meaning a mocking, deceit, or illusion, stemming from the verb 'illudere' (to mock at, play upon). It entered the English language in the late 14th century through Old French, initially retaining religious and philosophical connotations before expanding to sensory and optical deceptions.

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