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countable and uncountable, plural megalomanias
A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence. quotations examples
As to Ernest... He is quite as nervously broken down as I am but it manifests itself in different ways. His inclination is towards megalomania and mine towards melancholy.
1936 Sept. 15, F. Scott Fitzgerald, letter to Beatrice Dance
(obsolete) Narcissistic personality disorder.
An obsession with grandiose or extravagant things or actions. examples