A group of students taught together in a school or college. It can also refer to a specific lesson, subject, or the room where teaching activities take place, such as a classroom.

学校(がっこう)で一緒(いっしょ)に教(おし)わる生徒(せいと)の集団(しゅうだん)、または特定(とくてい)の授業(じゅぎょう)や授業(じゅぎょう)が行(おこな)われる部屋(へや)。