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English definition of “monomania”

monomania

noun [C or U] uk   /ˌmɒn.əʊˈmeɪ.ni.ə/ us    /ˌmɑː.noʊ-/
a condition in which someone is extremely interested in one thing, in a way that is not normal
monomaniac
adjective, noun uk   /-æk/ us  
monomaniacal
adjective uk   /-məˈnaɪə.kəl/ us  
His interest in personal fitness borders on the monomaniacal.
(Definition of monomania from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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