noun
assembly room; meeting room; community room
A room in a building such as a community center, school, or apartment complex used for gatherings, meetings, or events.
マンションの集会室で住民説明会が開かれた。
A residents' briefing was held in the apartment building's community room.
公民館の集会室を借
We rented the assembly room at the community center and held our meeting.
Compound of 集会 (しゅうかい, 'assembly, meeting') and 室 (しつ, 'room').