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



    BrE BrE//dɪˈluːʒn//
    ; NAmE NAmE//dɪˈluːʒn//
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  1. 1[countable] a false belief or opinion about yourself or your situation the delusions of the mentally ill Don't go getting delusions of grandeur (= a belief that you are more important than you actually are). He was suffering from paranoid delusions and hallucinations. Love can be nothing but a delusion.
  2. 2[uncountable] the act of believing or making yourself believe something that is not true He seems to have retreated into a world of fear and delusion. see also delude
  3. Word Originlate Middle English (in the sense ‘act of deluding or of being deluded’): from late Latin delusio(n-), from the verb deludere ‘to mock’, from de- (with pejorative force) + ludere ‘to play’.Extra examples He dismissed the so-called miracle as a collective delusion. He had no delusions about his feelings for Kate. He seemed to be under the delusion that he would make his fortune within a few years. I thought the whole idea was just a foolish and dangerous delusion. She had delusions of persecution. The psychiatrist said she was suffering from paranoid delusions. Don’t go getting delusions of grandeur. He’s under some delusion that I’m going to cheat him. Many people with this condition suffer from delusions. My mother had a tremendous capacity for delusion. She believes her critics are not really important. This is a dangerous and foolish delusion.
See the Oxford Advanced American Dictionary entry: delusion

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