Source : Webster's Revised Unabridged Dictionary (1913)

Pack \Pack\, v. t. [imp. & p. p. {Packed}; p. pr. & vb. n.
   {Packing}.] [Akin to D. pakken, G. packen, Dan. pakke, Sw.
   packa, Icel. pakka. See {Pack}, n.]
   1. To make a pack of; to arrange closely and securely in a
      pack; hence, to place and arrange compactly as in a pack;
      to press into close order or narrow compass; as to pack
      goods in a box; to pack fish.

            Strange materials packed up with wonderful art.
                                                  --Addison.

            Where . . . the bones Of all my buried ancestors are
            packed.                               --Shak.

   2. To fill in the manner of a pack, that is, compactly and
      securely, as for transportation; hence, to fill closely or
      to repletion; to stow away within; to cause to be full; to
      crowd into; as, to pack a trunk; the play, or the
      audience, packs the theater.

   3. To sort and arrange (the cards) in a pack so as to secure
      the game unfairly.

Packing \Pack"ing\, n.
   1. The act or process of one who packs.

   2. Any material used to pack, fill up, or make close.
      Specifically (Mach.): A substance or piece used to make a
      joint impervious; as:
      (a) A thin layer, or sheet, of yielding or elastic
          material inserted between the surfaces of a flange
          joint.
      (b) The substance in a stuffing box, through which a
          piston rod slides.
      (c) A yielding ring, as of metal, which surrounds a piston
          and maintains a tight fit, as inside a cylinder, etc.

   3. (Masonry) Same as {Filling}. [Rare in the U. S.]

   4. A trick; collusion. [Obs.] --Bale.

   {Cherd packing} (Bridge Building), the arrangement, side by
      side, of several parts, as bars, diagonals, a post, etc.,
      on a pin at the bottom of a chord. --Waddell.

   {Packing box}, a stuffing box. See under {Stuffing}.

   {Packing press}, a powerful press for baling cotton, wool,
      hay, etc.

   {Packing ring}. See {Packing}, 2
      (c), and Illust. of {Piston}.

   {Packing sheet}.
      (a) A large cloth for packing goods.
      (b) A sheet prepared for packing hydropathic patients.

Source : WordNet®

packing
     n 1: any material used especially to protect something [syn: {packing
          material}, {wadding}]
     2: the enclosure of something in a package or box [syn: {boxing}]
     3: carrying something in a pack on the back; "the backpacking
        of oxygen is essential for astronauts" [syn: {backpacking}]