Round
One complete pass through all the movements listed in a workout.
What it means in a class
A round is a full lap of the workout: you've done every movement on the list once and you're back at the top. In an AMRAP your score counts rounds; in a 'for time' workout you'll be told how many rounds to complete.
'3 rounds for time' means do the whole list three times as quickly as you safely can.