1 [countable + singular or plural verb] a group of students who are taught together We were in the same class at school. She is the youngest in her class. He came top of the class. The whole class was/were told to stay behind after school. 2 [countable, uncountable] an occasion when a group of students meets to be taught I was late for a class. See me after class. She works hard in class (= during the class). I have a history class at 9 o'clock.