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[meg-uh-loh-mey-nee-uh] /ˌmɛg ə loʊˈmeɪ ni ə/
Psychiatry. a symptom of mental illness marked by delusions of greatness, wealth, etc.
an obsession with doing extravagant or grand things.
Origin of megalomania
First recorded in 1885-90; megalo- + -mania Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for megalomania


a mental illness characterized by delusions of grandeur, power, wealth, etc
(informal) a lust or craving for power
Derived Forms
megalomaniac, adjective, noun
megalomaniacal (ˌmɛɡələʊməˈnaɪəkəl) adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for megalomania

"delusions of greatness," 1866, from French mégalomanie; see megalo- + mania "madness."

Online Etymology Dictionary, © 2010 Douglas Harper
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megalomania in Medicine

megalomania meg·a·lo·ma·ni·a (měg'ə-lō-mā'nē-ə, -mān'yə)

  1. A psychopathological condition in which delusional fantasies of wealth, power, or omnipotence predominate.

  2. An obsession with grandiose or extravagant things or actions.

meg'a·lo·ma'ni·ac' n.
meg'a·lo·ma·ni'a·cal (-mə-nī'ə-kəl) or meg'a·lo·man'ic (-mān'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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megalomania in Culture
megalomania [(meg-uh-loh-may-nee-uh)]

Delusions of grandeur; an extreme form of egotism. Adolf Hitler is generally considered to have been a megalomaniac.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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