reserved seat
A seat that is reserved in advance, commonly used for trains, theaters, and events. Often contrasted with 自由席 (unreserved seat).
See also: 自由席
新幹線の指定席を予約しました。
I reserved a seat on the Shinkansen.
この列車は全席指定席です。
This train is all reserved seating.
I booked a reserved seat on the shinkansen.
I sat in my reserved seat and read a book.
The reserved seats on that train were already sold out.