port number ==>
1. <networking> A logical channel or channel endpoint in a communications
system. The Transmission Control Protocol and User Datagram Protocol transport
layer protocols used on Ethernet use port numbers to distinguish between
(demultiplex) different logical channels on the same network interface on a
Each application program has a unique port number associated with it, defined in
/etc/services or the Network Information Service "services" database. Some
protocols, e.g. telnet and HTTP (which is actually a special form of telnet)
have default ports specified as above but can use other ports as well.
Some port numbers are defined in RFC 3232 (which replaces RFC 1700). Ports are
now divided into: "Well Known" or "Privileged", and "Ephemeral" or
"Unprivileged" (comprising "Registered", "Dynamic", "Private").
2. <operating system, programming> To translate or modify software to run
on a different platform, or the results of doing so. The portability of the
software determines how easy it is to port.
3. <language> An imperative language descended from Zed from Waterloo
Microsystems (now Hayes Canada) ca. 1979.
["Port Language" document in the Waterloo Port Development System].
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