Gateway meaning

gāt'wā'
Something that serves as an entrance or a means of access.

A gateway to success; the gateway to the West.

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An opening or a structure framing an opening, such as an arch, that may be closed by a gate.
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Software or hardware that enables communication between computer networks that use different communications protocols.
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In H.323-compliant multimedia networks, a gateway is an optional element used for various levels of protocol conversion.The gateway serves as a protocol converter between devices and networks that have native H.323 capability and those that do not. The gateway also may translate between audio, video, and data formats, and may perform signaling conversions between the H.225 packet protocol and external protocols such as SS7 and Q.931. Alternatively, signaling conversions may be performed by gatekeepers, call processors, or session border controllers. See also H.225, H.323, multimedia, network, packet, protocol, protocol converter, Q.931, session, and SS7.
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The definition of a gateway is an opening or entrance.

An example of a gateway is the doorway of a barn.

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An entrance as in a wall, fitted with a gate.
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A means of access.
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(1) A network device that provides access to the Internet for the home or small office. See cable/DSL gateway.
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A node that interconnects two or more disparate networks, both physically and logically, serving as a protocol converter (e.g., PSTN to IP) and media converter (e.g., electrical twisted pair to optical fiber) as necessary. See also IGF, node, and protocol converter.
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The collection of hardware and software required to interconnect two or more disparate networks, including performing protocol conversion. See also hardware, protocol converter, and software.
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The router or communication node connecting an internal or local area network to the Internet or another type of wide-area network. Today, the term has taken on a slightly wider definition in which a gateway is dedicated to a specific functional service to provide an intermediary between two or more systems. For example, an LDAP master server (a server that provides authentication and directory services) in a multimode master setup is a gateway when more than one master server exists. Gateway is also the name of a successful computer and peripherals vendor operating mainly through online channels.
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​An entrance capable of being blocked by use of a gate.
  • 1963, Margery Allingham, chapter 1, The China Governess.
    The original family who had begun to build a palace to rival Nonesuch had died out before they had put up little more than the gateway, […].
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Any point that represents the beginning of a transition from one place or phase to another.
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A point at which freight moving from one territory to another is interchanged between transportation lines.
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(digital communications) In wireless internet, an access point with additional software capabilities such as providing NAT and DHCP, which may also provide VPN support, roaming, firewalls, various levels of security, etc.
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Origin of gateway