megalomania

noun
🔊/ˌmeɡələˈmeɪniə/
🔊/ˌmeɡələˈmeɪniə/
[uncountable]
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  1. (specialist) a mental illness or condition in which somebody has a much greater belief in their own importance or power than is reasonable自大狂;夸大狂;妄自尊大Topics Illnessc2
  2. a strong feeling that you want to have more and more power渴望权力;权欲熏心