prom
n. C / U B1 Intermediate US //ˈpɹɑm// UK //pɹˈɒm// prom
n. a formal dance or party for high school students, usually held at the end of the school year. It is a big event where students dress in suits and fancy dresses.
n. a formal dance held for a high school class at the end of the academic year. Often used as a shortened form of 'promenade'.
She spent weeks looking for the perfect dress for prom.
Many students rent limousines to arrive at the prom in style with their group of friends.
While the prom is often depicted in media as a pivotal social milestone, for many students it is simply a celebratory conclusion to their secondary education.
In all senses, by acronymy.
Usage
Often used as a modifier before other nouns, such as 'prom dress' or 'prom night'.