Simple Definition of megalomania
: a condition or mental illness that causes people to think that they have great or unlimited power or importance
Full Definition of megalomania
1 : a mania for great or grandiose performance
2 : a delusional mental disorder that is marked by feelings of personal omnipotence and grandeur
Examples of megalomania in a sentence
Their CEO has an arrogance that borders on megalomania.
Origin of megalomania
First Known Use: 1885
Medical Definition of megalomania
: a delusional mental illness that is marked by feelings of personal omnipotence and grandeur
Seen and Heard
What made you want to look up megalomania? Please tell us where you read or heard it (including the quote, if possible).