1Seating provided for guests, spectators, or passengers, as in a theater, stadium, or vehicle.
開演前に客席の照明が落とされた。
Before the show began, the house lights in the audience seating were dimmed.
タクシーの客席にはチャイルドシートが取り付けられていた。
A child seat was installed in the taxi's passenger seat.
発売と同時に客席のチケットは完売した。
The seating tickets sold out the moment they went on sale.
2Refers to the audience itself (the people watching), or their reaction, in a theater or similar venue.
名演技に客席がどよめいた。
The audience buzzed at the brilliant performance.
コメディアンが客席をいじって笑いを取った。
The comedian got laughs by playfully engaging with the audience.