free port 
noun
1A port open to all traders.One of the first Latin American countries to open a free port, Paraguay became a centre of retail commerce of foreign goods, representing a substantial slice of its country's economy....
- Another 80 marines deployed to the free port of Monrovia to conduct engineering work needed to open the port to humanitarian relief.
- A new urban creation, the free port, challenged the old commercial and shipping powers.
1.1A port area where goods in transit are exempt from customs duty.The economy shifted to trade, and in 1724 Charlotte Amalie became a free port where goods were exempt from customs duties and regulation....
- A decree substantially enlarging the free port area, which is located along a 15 km stretch on both sides of the Daugava River, came into force this year.
- Nonetheless, when the city obtained the privileged tariff status of a free port in 1784, goods arriving from abroad at Bayonne rose by 60 per cent.