Definition of delusion noun from the Oxford Advanced American Dictionary

     

    delusion

     noun
    noun
    NAmE//dɪˈluʒn//
     
     
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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 the Oxford Advanced Learner's Dictionary entry: delusion

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