illusion ( illusions plural )
1 n-var An illusion is a false idea or belief.
oft N that, N of n/-ing
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
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
actuality, reality, truth
English Collins Dictionary - English synonyms & Thesaurus
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