megalomania

 
Pronunciation: /ˌmɛg(ə)lə(ʊ)ˈmeɪnɪə/

noun

[mass noun]
  • obsession with the exercise of power.
  • delusion about one’s own power or importance (typically as a symptom of manic or paranoid disorder).

Derivatives

megalomanic

Pronunciation: /-ˈmanɪk/
adjective