Recess was a brief respite from schoolwork in which students could play games outdoors.
In 2268, James T. Kirk told Elaan that her lessons in courtesy would have to be postponed for a short recess. (TOS: "Elaan of Troyius")
B'Elanna Torres recalled once beating up Daniel Byrd at recess to get back at him for bullying her. (VOY: "Juggernaut")