1. A person or company that is granted a concession to operate a business or service within a specific territory or under specific conditions
The airport concessionaire operates the duty-free shops and restaurants.
O concessionário do aeroporto opera as lojas duty-free e restaurantes.
2. A person who holds a license or permit to conduct a specific commercial activity
The gas station concessionaire must maintain certain quality standards.
O concessionário do posto de gasolina deve manter certos padrões de qualidade.