megalomania
noun
meg·a·lo·ma·nia
ˌme-gə-lō-ˈmā-nē-ə 
-nyə
1
: a mania (see mania sense 2a) for great or grandiose performance
… an outburst of wildly extravagant commercial megalomania …—
The Times Literary Supplement (London)
The Times Literary Supplement (London)2
: a delusional mental illness 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.
Recent Examples on the Web
Trump’s megalomania is transforming the United States from international leader into international pariah, and the American people will suffer the consequences for years to come.
—Robert Kagan, The Atlantic, 18 Jan. 2026
But ideology and megalomania drove their ambitions.
—Max Hastings, Twin Cities, 11 Jan. 2026
Save your megalomania for that.
—Literary Hub, 10 Dec. 2025
Both attitudes—the inferiority, the megalomania—are dangerous.
—Simon Akam, New Yorker, 1 Dec. 2025
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Robert Kagan, The Atlantic, 18 Jan. 2026
But ideology and megalomania drove their ambitions.
—Max Hastings, Twin Cities, 11 Jan. 2026
Save your megalomania for that.
—Literary Hub, 10 Dec. 2025
Both attitudes—the inferiority, the megalomania—are dangerous.
—Simon Akam, New Yorker, 1 Dec. 2025
See All Example Sentences for megalomania
Cite this Entry
“Megalomania.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/megalomania. Accessed 29 Jan. 2026.
Copy CitationMedical Definition
megalomania
noun
meg·a·lo·ma·nia
ˌmeg-ə-lō-ˈmā-nē-ə, -nyə
: a delusional mental illness that is marked by feelings of personal omnipotence and grandeur
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