1. The principal entrance or access point to a building, property, or network system
The main gateway of the castle was heavily guarded.
O portão principal do castelo era fortemente guardado.
2. In computing, the primary device or software that connects a local network to external networks
The router serves as the main gateway for all internet traffic.
O roteador funciona como o portão principal para todo o tráfego de internet.
3. A major entry point or transition to a larger area or system
The airport is the main gateway to the city.
O aeroporto é o portão principal para a cidade.