megalomaniac

Meanings

1. 1
   noun

   a person obsessed with power or convinced of their own exceptional greatness and importance

   The novel's ruler is a megalomaniac who demands monuments in every city.

2. 2
   adj

   showing an obsessive desire for power or an exaggerated belief in one's own importance

   His megalomaniac plan placed the entire organization under his personal control.

Formed from megalomania + -ac. Megalomania combines Greek megas, stem megal- ("great"), with mania ("madness, frenzy"), naming an exaggerated belief in one's greatness or power.

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