an entrance or passage that may be closed by a gate.
a structure for enclosing such an opening or entrance.
any passage by or point at which a region may be entered: New York soon became the gateway to America.
software or hardware that links two computer networks.

1700–10; gate1 + way Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gateway (ˈɡeɪtˌweɪ)
1.  an entrance that may be closed by or as by a gate
2.  a means of entry or access: Mumbai, gateway to India
3.  (modifier) allowing entry, access, or progress to a more extreme form: gateway drug; gateway drink
4.  computing hardware and software that connect incompatible computer networks, allowing information to be passed from one to another
5.  a software utility that enables text messages to be sent and received over digital cellular telephone networks

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  gateway
Part of Speech:  n
Definition:  See residential gateway's 21st Century Lexicon
Copyright © 2003-2014, LLC
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Computing Dictionary

gateway definition

1. 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. 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.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Beyond the gateway trellis, a new stone path leads to an expanded entry
The builder of the old gateway had no thought of its ever becoming a public
In short, when it wanted but three days to summer, the only part that remained
  to be finished was the gateway.
The caves served as a gateway, and their walls were considered porous.
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