Rep

A rep, or repetition, is a full lifting and returning of a weight during an exercise. Most exercises consist of a positive and negative phase and a rep is a movement of a weight or resistance between these.

A full rep is when a resistance is lifted through the whole range of movement of an exercise. Using the bench press as an example, a full rep is where the bar is lifted from the chest all the way until the arms are straight (but not locked) and back down to the chest. The resistance should be controlled the whole duration of the lift, not allowing gravity or momentum to help.