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Definition of megalomania noun from the Oxford Advanced Learner's Dictionary

megalomania

noun
 
/ˌmeɡələˈmeɪniə/
 
/ˌmeɡələˈmeɪniə/
[uncountable]
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  1. (disapproving) a strong feeling that you want to have more and more power
  2. (psychology) a mental illness in which somebody has a much greater belief in their own importance or power than is reasonableTopics Mental healthc2
See megalomania in the Oxford Advanced American Dictionary
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