megalomania

noun meg·a·lo·ma·nia \ˌme-gə-lō-ˈmā-nē-ə, -nyə\

: a condition or mental illness that causes people to think that they have great or unlimited power or importance

Full Definition of MEGALOMANIA

: a mania for great or grandiose performance

: a delusional mental disorder that is marked by feelings of personal omnipotence and grandeur

— meg·a·lo·ma·ni·ac \-ˈmā-nē-ˌak\ adjective or noun

— meg·a·lo·ma·ni·a·cal \-mə-ˈnī-ə-kəl\ also meg·a·lo·man·ic \-ˈma-nik\ adjective

— meg·a·lo·ma·ni·a·cal·ly \-mə-ˈnī-ə-k(ə-)lē\ adverb

See megalomania defined for English-language learners

New Latin

First Known Use: 1885

Medical Dictionary

noun meg·a·lo·ma·nia \ˌmeg-ə-lō-ˈmā-nē-ə, -nyə\

: a delusional mental disorder that is marked by feelings of personal omnipotence and grandeur

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