Gateway

n.

1.

A passage through a fence or wall; a gate; also, a frame, arch, etc., in which a gate in hung, or a structure at an entrance or gate designed for ornament or defense.

Noun

1.

gateway - an entrance that can be closed by a gate

1.	(networking)	gateway - A deprecated term for a device that enables data to flow between different networks (forming an internet). Preferred terms are "protocol converter" (connects networks that use different protocols), "router" (connects two broadcast networks at layer 3 (network layer). Another example is a mail gateway, which is a layer 7 (application layer) gateway.
2.	(hypertext)	gateway - An interface between an information source and a World-Wide Web server. Common Gateway Interface is a standard for such interfaces. The information source can be any system that can be accessed by a program running on the web server. A typical example is a relational database.

French door, archway, back door, barway, bulkhead, carriage entrance, cellar door, cellarway, door, doorjamb, doorpost, doorway, front door, gate, gatepost, hatch, hatchway, lintel, porch, portal, porte cochere, postern, propylaeum, pylon, scuttle, side door, stile, storm door, threshold, tollgate, trap, trap door, turnpike, turnstile