meg·a·lo·ma·ni·a (m?g??-l?-m??n?-?, -m?n?y?)n.1. A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence.2. An obsession with grandiose or extravagant things or actions.meg?a·lo·ma?ni·ac? n.meg?a·lo·ma·ni?a·cal (-m?-n???-k?l), meg?a·lo·man?ic (-m?n??k) adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.megalomania (?m???l???me?n??) n1. (Psychology) a mental illness characterized by delusions of grandeur, power, wealth, etc2. informal a lust or craving for power ?megalo?maniac adj, n megalomaniacal adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014meg?a?lo?ma?ni?a (?m?g ? lo??me? ni ?) n. 1. a highly exaggerated or delusional concept of one’s own importance. 2. an obsession with extravagant or grand things. [1885?90] meg`a?lo?ma?ni?ac, n. meg`a?lo?ma?ni?a?cal (-m??na? ? k?l) meg`a?lo?man?ic (-?mæn ?k) adj. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.megalomania1. Psychiatry. a form of mental illness marked by delusions of greatness, wealth, or power.2. an obsession with doing extravagant or grand things. ? megalomaniac, n. ? megalomaniacal, adj.See also: Grandeur1. Medicine. a form of mental illness characterized by the unreasonable conviction in the patient of his own greatness, goodness, power, or wealth.2. an obsession with extravagant or grand actions. ? megalomaniac, n., adj. ? megalomaniacal, adj.See also: Insanity-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.megalomaniaArising from exaggerated valuation of oneself, this state is characterized by delusions of grandeur.Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited