gate‧way /ˈɡeɪt-weɪ/ noun

1. [countable] the opening in a fence, wall etc that can be closed by a gate

2. gateway to something
a) a place, especially a city, that you can go through in order to reach another much bigger place:
St. Louis is the gateway to the West.
b) a way of achieving something:
To me a home in the country is a gateway to happiness.

3. [countable] a way of connecting two computer networks

[TahlilGaran] Dictionary of Contemporary English ▲

Gateway
In the context of travel activities, gateway refers to a major airport or seaport. Internationally, gateway can also mean the port where customs clearance takes place.

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲