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illusion noun [ ɪˈluːʒ(ə)n ]

• an instance of a wrong or misinterpreted perception of a sensory experience.
• "stripes embellish the surface to create the illusion of various wood-grain textures"
Similar: mirage, hallucination, apparition, phantasm, phantom, vision, spectre, fantasy, figment of the imagination, will-o'-the-wisp, trick of the light, ignis fatuus,
Origin: Middle English (in the sense ‘deceiving, deception’): via Old French from Latin illusio(n- ), from illudere ‘to mock’, from in- ‘against’ + ludere ‘play’.

be under the illusion that

• believe mistakenly that.
"the world is under the illusion that the original painting still hangs in the Winter Palace"

be under no illusion

• be fully aware of the true state of affairs.



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