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monomania

noun [C or U]
 
 
/ˌmɒn.əʊˈmeɪ.ni.ə/ US  /ˌmɑː.noʊ-/

Definition

a condition in which someone is extremely interested in one thing, in a way that is not normalMental and psychiatric disorders monomaniac
 
 
/-æk/ adjective, noun
Mental and psychiatric disorders
monomaniacal
 
 
/-məˈnaɪə.kəl/ adjective
His interest in personal fitness borders on the monomaniacal.Mental and psychiatric disorders
(Definition of monomania noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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