noun
A somewhat formal term for a room used for daily living. In casual speech for a family living room, 居間 or リビング is often more natural.
このマンションの居室は南向きで明るい。
The living room in this apartment faces south and is bright.
冬は居室の換気を忘れないようにしている。
In winter, I try not to forget to ventilate the living room.
Sino-Japanese compound of 居, associated with residing or being present, and 室, meaning room. The spelling directly reflects the idea of a room one lives in or occupies.