A spacious waiting area near the entrance of a building such as a hotel or theater; a place where guests wait or a reception area (from English 'lobby').
到着したらまずロビーでチェックインしてください。
When you arrive, please check in at the lobby first.
授業の前に学生たちはロビーで話をしていた。
Before class, the students were chatting in the lobby.
コンサートホールのロビーは人でいっぱいだった。
The concert hall lobby was full of people.