Psychiatry. a symptom of mental illness marked by delusions of greatness, wealth, etc.
an obsession with doing extravagant or grand things.

1885–90; megalo- + -mania Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
megalomania (ˌmɛɡələʊˈmeɪnɪə)
1.  a mental illness characterized by delusions of grandeur, power, wealth, etc
2.  informal a lust or craving for power
adj, —n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1890, from Fr. mégalomanie, formed from Gk. megas (gen. megalou) "great" (see mickle) + mania "madness."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Cultural Dictionary
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 American Heritage® 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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Example sentences
McCall seems to have a special place in his demolition kit for megalomania, of
  both the imperial and technological variety.
There is a fine line between selling yourself and megalomania, and this guy
  leaped over it.
In the 1960s, one French politician accused it of “morbid
He also displayed a certain flair for megalomania.
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