noun, noun or participle which takes 'suru', intransitive verb
exiting a room; leaving a room
Formal term used in schools, offices, or official settings when someone leaves a room. Often seen in signs or announcements. The antonym is 入室 (にゅうしつ).
See also: 入室
試験中は許可なく退室できません。
You cannot leave the room during the exam without permission.
会
The meeting ended, and the participants left the room one after another.