noun
day room; lounge; social hall
A common room for socializing, especially on a ship or in a hotel. The term is straightforward and not particularly rare.
船の社交室で他の乗客と話した。
I talked with other passengers in the ship's day room.
ホテルの社交室は午後10時に閉まる。
The hotel lounge closes at 10 p.m.