1. A system in which people or things are dealt with in the order in which they arrive or apply, without any special consideration or priority
Concert tickets will be sold on a first-come first-served basis.
Os ingressos para o concerto serão vendidos por ordem de chegada.
2. Operating on the principle that whoever arrives or requests something first gets priority
Parking spaces are available on a first-come first-served basis.
As vagas de estacionamento estão disponíveis por ordem de chegada.