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megalomania

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The definition of megalomania is a mental illness where the person believes they are very important and superior, or a tendency to do very extravagant things.

(noun)

An example of megalomania is a mentally ill person who thinks they are the Queen of England.
An example of megalomania is a mom throwing her three year old a birthday party with one hundred guests.

See megalomania in Webster's New World College Dictionary

noun

a mental disorder characterized by delusions of grandeur, power, etc.
a passion for, or for doing, big things
a tendency to exaggerate

Origin: ModL: see megalo- & mania

Related Forms:

megalomaniac adjective, noun
megalomaniacal adjective
megalomanic adjective

See megalomania in American Heritage Dictionary 4

noun

A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence.
An obsession with grandiose or extravagant things or actions.

Related Forms: