OVERLONG Meaning of OVERLONG in English o ‧ ver ‧ long /ˌəʊvəˈlɒŋ◂ $ ˌoʊvərˈlɒːŋ◂/ BrE AmE adjective continuing for too long:an overlong performance Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012