Definition of megalomaniac adjective from the Oxford Advanced Learner's Dictionary

     

    megalomaniac

     adjective
    adjective
    BrE BrE//ˌmeɡələˈmeɪniæk//
     
    ; NAmE NAmE//ˌmeɡələˈmeɪniæk//
     
     
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  1. 1showing a strong feeling that you want to have more and more power The megalomaniac leader finally crowned himself Emperor. There was a megalomaniac streak in him that made him believe anything was possible.
  2. 2(specialist) suffering from a mental illness or condition in which somebody has an exaggerated belief in their own importance or power

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