monomania

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mon·o·ma·ni·a / ˌmänəˈmānēə/ • n. exaggerated or obsessive enthusiasm for or preoccupation with one thing. DERIVATIVES: mon·o·ma·ni·ac / -ˈmānēˌak/ n. & adj. mon·o·ma·ni·a·cal / -məˈnīəkəl/ adj.

monomania

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monomania (mon-oh-may-niă) n. the state in which a particular delusion or set of delusions is present in an otherwise normally functioning person. See also paranoia.