/ prɒm; NAmE prɑːm/ noun
1.
(especially in the US) a formal dance, especially one that is held at a high school :
the senior prom
2.
( BrE , informal , becoming old-fashioned ) = promenade noun (1):
to walk along the prom
3.
( BrE ) = promenade concert :
the last night of the proms