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 for port
From The Free On-line Dictionary of Computing (30 December 2018) :

  port number
     1.  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 computer.
     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
     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.  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.  An imperative language descended from Zed
     from Waterloo Microsystems (now Hayes Canada) ca. 1979.
     ["Port Language" document in the Waterloo Port Development

Contact=webmaster@dict.org Specification=RFC 2229