Arriving first; the person or people who arrive before others. Often used in contexts like "first-come, first-served."
先着100名に割引クーポンを配布します。
Discount coupons will be distributed to the first 100 arrivals.
会場には先着順で入場してください。
Please enter the venue on a first-come, first-served basis.
チケットは先着で売り切れた。
Tickets sold out on a first-come basis.