prom
Concise Oxford English Dictionary © 2008 Oxford University Press:
prom/prɒm/
▶noun informal
- 1 Brit. short for promenade (sense 1 of the noun).
- 2 (also Prom) Brit. a promenade concert.
- 3 N. Amer. a formal dance, especially one at a high school or college.
'prom' also found in these Oxford entries:

