A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence.(noun)
An obsession with grandiose or extravagant things or actions.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "megalomania" in a sentence
"The guy can still do a decent show, but his megalomania is astounding."
"The lessons he provides in military tactics are nothing compared to the lessons he provides about what happens when megalomania is harnessed to determination."
"Sadly, megalomania is not just limited to the Republicans – I think all politicians and preachers suffer from it."