OVERACTIVITY Meaning of OVERACTIVITY in English overactivity BrE AmE ˌəʊv ə r æk ˈtɪv ət i -ɪt i AmE \ ˌoʊv ə r æk ˈtɪv ət̬ i Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012