1.
classroom
A room in a school or educational institution where classes are taught. The physical space where learning takes place.
2.
class, course (as a place)
Can also refer to a learning class or course, as in 料理教室 (cooking class) or 英語教室 (English class).
教室 means classroom (a room for teaching) or a class/course/school.
WORD FORMATION:
教 (teach) + 室 (room) = teaching room
SENSE 1 - CLASSROOM:
- 教室に入る: to enter the classroom
- 教室を掃除する: to clean the classroom
- 教室は三階です: The classroom is on the third floor
SENSE 2 - CLASS/COURSE:
- 料理教室: cooking class
- ピアノ教室: piano class/school
- 英会話教室: English conversation class
- 水泳教室: swimming class
OTHER 〜室 COMPOUNDS:
- 会議室: meeting room
- 研究室: laboratory, professor's office
- 事務室: office
- 待合室: waiting room
- 更衣室: changing room