prom Syllabification: (prom)Pronunciation: /präm/Translate prom | into Italian | into Spanish Definition of prom noun informal 1a formal dance, especially one held by a class in high school or college at the end of a year. 2Britishshort for promenade (sense 1 of the noun). 3 (also Prom) Britishshort for promenade concert.the last night of the Promsprom in other Oxford dictionaries Definition of prom in the British & World English dictionary