Definition of illusion noun from the Oxford Advanced Learner's Dictionary

     

    illusion

     noun
    noun
    BrE BrE//ɪˈluːʒn//
     
    ; NAmE NAmE//ɪˈluːʒn//
     
     
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  1. 1[countable, uncountable] a false idea or belief, especially about somebody or about a situation She's under the illusion that (= believes wrongly that) she'll get the job. The new president has no illusions about the difficulties facing her country (= she knows that the country has serious problems). I have no illusions about her feelings for me (= I know the truth is that she does not love me). He could no longer distinguish between illusion and reality. I don’t want to have my illusions shattered!
  2. 2[countable] something that seems to exist but in fact does not, or seems to be something that it is not Mirrors in a room often give an illusion of space. The idea of absolute personal freedom is an illusion.
  3. Word Origin Middle English (in the sense ‘deceiving, deception’): via Old French from Latin illusio(n-), from illudere ‘to mock’, from in- ‘against’ + ludere ‘play’.Extra examples I don’t want to give him any false illusions. I never had any grand illusions of winning. I think I have lost all the illusions I had left. It turned out that their happy marriage was all an illusion. Now is the time to shed our illusions. She had no illusions about her attractiveness to men. The figure was only a trick of light, a mere illusion. The huge size of the vehicle gives the illusion of safety. The road ahead looks wet, but in fact this is an optical illusion. The slogan provides the comforting illusion that something is being done. They are trying to maintain the illusion that the company is in good shape. They are under no illusions about the difficulties ahead of them. To believe you have nothing more to learn is a dangerous illusion. Within the first week at college all my illusions were shattered. Don’t have any illusions that they’re here to help you. He could no longer tell the difference between illusion and reality. He’s under the illusion that he will get the job. I have no illusions about her feelings for me. Meeting my hero in real life really shattered all my illusions about him. They wanted to create the illusion of being a close, happy family. To believe that you’re safe is a dangerous illusion.
See the Oxford Advanced American Dictionary entry: illusion

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