A long bench or seat that several people can sit on; similar to a park bench, waiting-room seat, or a settee/sofa.
公園の長椅子に座って本を読んだ。
I sat on a park bench and read a book.
待合室には長椅子が並んでいる。
Benches line the waiting room.
古い家には木製の長椅子が置いてあった。
There was a wooden settee in the old house.