1 [countable] informalBB
a sales representative
someone who speaks officially for a company, organization, or group of people [= representative]
staff/union/company etc rep
You need to speak to the students' rep.
Safety reps have the right to stop the job when workers are in danger.
3 [countable] American English
4 [uncountable and countable]APT
repertory, or a repertory theatre or company:
Most actors start off in rep.
5 [countable] American English spokenP
one exercise that you do in a series of exercises [= repetition]:
Do 15 reps of each exercise.