baseball Syllabification: (base·ball)Pronunciation: /ˈbāsˌbôl/Translate baseball | into French | into German | into Italian | into Spanish Definition of baseball noun a ball game played between two teams of nine on a field with a diamond-shaped circuit of four bases. It is played chiefly in the US, Canada, Latin America, and East Asia. the hard ball used in the game of baseball. baseball in other Oxford dictionaries Definition of baseball in the British & World English dictionary