megalomaniac

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megalomaniac /ˌmɛgəloʊˈmeɪniˌæk/ noun
plural megalomaniacs
megalomaniac
/ˌmɛgəloʊˈmeɪniˌæk/
noun
plural megalomaniacs
Learner's definition of MEGALOMANIAC
[count]
: a person who believes that he or she has unlimited power or importance : a person who has megalomania

— megalomaniacal

/ˌmɛgəloʊməˈnajəkəl/ adjective