order of applications; in order of application
参加は申し込み順で受け付ける。
Participation is accepted on a first-come, first-served basis.
申し込み順に座席が決まる。
Seats are assigned in the order of application.
定員に達したら申し込み順で打ち切りとなる。
Once capacity is reached, applications are cut off in order.