noun
unreserved seat; non-reserved seat
Refers to a seat that is not assigned in advance, commonly used for trains, theaters, and events. Often contrasted with 指定席 (reserved seat).
See also: 指定席
新幹線の自由席は混んでいることが多い。
The unreserved seats on the Shinkansen are often crowded.
I bought an unreserved seat ticket, so I lined up early.