The Collaborative International Dictionary of English v.0.48:

Port \Port\, n. [F. porte, L. porta, akin to portus; cf. AS.
   porte, fr. L. porta. See Port a harbor, and cf. Porte.]
   1. A passageway; an opening or entrance to an inclosed place;
      a gate; a door; a portal. [Archaic]
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            Him I accuse
            The city ports by this hath entered.  --Shak.
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            Form their ivory port the cherubim
            Forth issuing.                        --Milton.
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   2. (Naut.) An opening in the side of a vessel; an embrasure
      through which cannon may be discharged; a porthole; also,
      the shutters which close such an opening.
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            Her ports being within sixteen inches of the water.
                                                  --Sir W.
                                                  Raleigh.
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   3. (Mach.) A passageway in a machine, through which a fluid,
      as steam, water, etc., may pass, as from a valve to the
      interior of the cylinder of a steam engine; an opening in
      a valve seat, or valve face.
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   Air port, Bridle port, etc. See under Air, Bridle,
      etc.

   Port bar (Naut.), a bar to secure the ports of a ship in a
      gale.

   Port lid (Naut.), a lid or hanging for closing the
      portholes of a vessel.

   Steam port, & Exhaust port (Steam Engine), the ports of
      the cylinder communicating with the valve or valves, for
      the entrance or exit of the steam, respectively.
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The Collaborative International Dictionary of English v.0.48:

Port \Port\, n. [AS. port, L. portus: cf. F. port. See Farm,
   v., Ford, and 1st, 3d, & 4h Port.]
   1. A place where ships may ride secure from storms; a
      sheltered inlet, bay, or cove; a harbor; a haven. Used
      also figuratively.
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            Peering in maps for ports and piers and roads.
                                                  --Shak.
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            We are in port if we have Thee.       --Keble.
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   2. In law and commercial usage, a harbor where vessels are
      admitted to discharge and receive cargoes, from whence
      they depart and where they finish their voyages.
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   Free port. See under Free.

   Port bar. (Naut,)
      (a) A boom. See Boom, 4, also Bar, 3.
      (b) A bar, as of sand, at the mouth of, or in, a port.

   Port charges (Com.), charges, as wharfage, etc., to which a
      ship or its cargo is subjected in a harbor.

   Port of entry, a harbor where a customhouse is established
      for the legal entry of merchandise.

   Port toll (Law), a payment made for the privilege of
      bringing goods into port.

   Port warden, the officer in charge of a port; a harbor
      master.
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