Meaning of “classroom” - Learner’s Dictionary

classroom

noun [ C ] us uk /ˈklɑːsruːm/
an overcrowded classroomPeople began to trickle into the classroom.The classrooms are very well-equipped.We debated the merits of using television in the classroom.We're only allowed to speak French in the classroom.

A1 a room in a school where students have lessons

(Definition of “classroom” from the Cambridge Learner’s Dictionary © Cambridge University Press)