予約済(よやくず)み

Composed of 予約(よやく) (reservation) and 済(す)み (completed, done — the noun form of 済(す)む). The ～済(す)み suffix is a productive pattern meaning "already done" or "completed," and attaches to many nouns and verb stems.

Usage

• Can function as a noun or a no-adjective: 予約済(よやくず)みの席(せき) (a reserved seat)
• Often seen on signs, labels, and in written notifications
• The ～済(す)み pattern is very productive: 支払(しはら)い済(す)み (paid), 確認(かくにん)済(す)み (confirmed), 登録(とうろく)済(す)み (registered)

Common collocations

• 予約済(よやくず)みの席(せき): a reserved seat
• 予約済(よやくず)みの部屋(へや): a booked room
• 予約済(よやくず)みの確認(かくにん): reservation confirmation

Similar words

• 予約(よやく)完了(かんりょう): reservation completed — more formal; used in system messages
• 確保(かくほ)済(す)み: secured — broader; used for resources, seats, or items that have been secured
• 手配(てはい)済(す)み: arranged — implies the arrangement or procurement has been completed