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

delusion

noun
 
/dɪˈluːʒn/
 
/dɪˈluːʒn/
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  1. [countable] a false belief or opinion about yourself or your situation
    • 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.
    • under the delusion that… They are under the delusion that the virus has gone away.
    Extra Examples
    • They dismissed the so-called miracle as a collective delusion.
    • He had no delusions about his feelings for Kate.
    • She seemed to be under the delusion that she would make her fortune within a few years.
    • He's under some delusion that I'm going to cheat him.
    • I thought the whole idea was just a foolish and dangerous delusion.
    • She had delusions of persecution.
    • Many people with this condition suffer from delusions.
    • She believes her critics are not really important. This is a dangerous and foolish delusion.
    Topics Opinion and argumentc2
    Oxford Collocations Dictionaryadjective
    • dangerous
    • paranoid
    • collective
    verb + delusion
    • get
    • harbour/​harbor
    • have
    preposition
    • under a/​the delusion
    • delusion about
    • delusion of
    phrases
    • delusions of grandeur
    See full entry
  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.
    • My mother had a tremendous capacity for delusion.
    see also delude
    Oxford Collocations Dictionaryadjective
    • dangerous
    • paranoid
    • collective
    verb + delusion
    • get
    • harbour/​harbor
    • have
    preposition
    • under a/​the delusion
    • delusion about
    • delusion of
    phrases
    • delusions of grandeur
    See full entry
  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’.
See delusion in the Oxford Advanced American DictionarySee delusion in the Oxford Learner's Dictionary of Academic English

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