1. [n]  the act of escorting while in transit
2. [n]  a collection of merchant ships with an escort of warships
3. [n]  a procession of land vehicles traveling together
4. [v]  escort in transit

Convoy
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1. \Con*voy"\, v. t. [imp. & p. p. {Convoyed}; p. pr. & vb.
   n. {Convoying}.] [F. convoyer, OF. conveier, convoier. See
   {Convey}.]
   To accompany for protection, either by sea or land; to attend
   for protection; to escort; as, a frigate convoys a
   merchantman.
         I know ye skillful to convoy The total freight of hope
         and joy.                                 --Emerson.
   

2. \Con"voy\, n. [F. convoi.]
   1. The act of attending for defense; the state of being so
      attended; protection; escort.
            To obtain the convoy of a man-of-war. --Macaulay.
   2. A vessel or fleet, or a train or trains of wagons,
      employed in the transportation of munitions of war, money,
      subsistence, clothing, etc., and having an armed escort.
   3. A protection force accompanying ships, etc., on their way
      from place to place, by sea or land; an escort, for
      protection or guidance.
            When every morn my bosom glowed To watch the convoy
            on the road.                          --Emerson.
   4. Conveyance; means of transportation. [Obs.] --Shak.
   5. A drag or brake applied to the wheels of a carriage, to
      check their velocity in going down a hill. --Knight.