Illusion meaning: Illusion definition

Illusion definition : The condition of being deceived by a false perception or belief. Definition of illusion noun from the Oxford Advanced Learner's Dictionary. [countable, uncountable] a false idea or belief, especially about somebody or about a situation. under the illusion that… She's under the illusion that (= believes wrongly that) she'll get the job. delusion, illusion, hallucination, mirage mean something that is believed to be true or real but that is actually false or unreal . delusion implies an inability to distinguish between what is real and what only seems to be real, often as the result of a disordered state of mind.