illusion meaning, illusion definition | English Cobuild dictionary

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illusion

  
  ( illusions    plural  )
1       n-var   An illusion is a false idea or belief.  
oft N that, N of n/-ing   (=delusion)  
No one really has any illusions about winning the war.     
2       n-count   An illusion is something that appears to exist or be a particular thing but does not actually exist or is in reality something else.  
oft N of n/-ing  
Floor-to-ceiling windows can give the illusion of extra height...     


optical illusion        ( optical illusions    plural  ) An optical illusion is something that tricks your eyes so that what you think you see is different from what is really there.      n-count  
Sloping walls on the bulk of the building create an optical illusion.     
Translation English Cobuild Collins Dictionary  
Collins

illusion

  
1    chimera, daydream, fantasy, figment of the imagination, hallucination, ignis fatuus, mirage, mockery, phantasm, semblance, will-o'-the-wisp  
2    deception, delusion, error, fallacy, false impression, fancy, misapprehension, misconception  
  
Antonyms     
   actuality, reality, truth  

English Collins Dictionary - English synonyms & Thesaurus  

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optical illusion

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