Definition of megalomania noun from the Oxford Advanced American Dictionary

     

    megalomania

     noun
    noun
    NAmE//ˌmɛɡəloʊˈmeɪniə//
     
    [uncountable]
     
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  1. 1(technology) a mental illness or condition in which someone has an exaggerated belief in their own importance or power
  2. 2a strong feeling that you want to have more and more power
See the Oxford Advanced Learner's Dictionary entry: megalomania