hypomania Syllabification: (hy·po·ma·ni·a)Pronunciation: /ˌhīpəˈmānēə/Definition of hypomania noun Psychiatry a mild form of mania, marked by elation and hyperactivity. Derivatives hypomanicPronunciation: /-ˈmanik/ adjective hypomania in other Oxford dictionaries Definition of hypomania in the British & World English dictionary