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megalomania (n.)

"delusions of greatness; a form of insanity in which the subjects imagine themselves to be great, exalted, or powerful personages," 1866, from French mégalomanie; see megalo- "great, exaggerated" + mania "madness."

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Definitions of megalomania from WordNet

megalomania (n.)
a psychological state characterized by delusions of grandeur;
From wordnet.princeton.edu