The Collaborative International Dictionary of English v.0.48:

Arm \Arm\, v. t. [imp. & p. p. Armed; p. pr. & vb. n.
   Arming.] [OE. armen, F. armer, fr. L. armare, fr. arma,
   pl., arms. See arms.]
   1. To take by the arm; to take up in one's arms. [Obs.]
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            And make him with our pikes and partisans
            A grave: come, arm him.               --Shak.
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            Arm your prize;
            I know you will not lose him.         --Two N. Kins.
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   2. To furnish with arms or limbs. [R.]
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            His shoulders broad and strong,
            Armed long and round.                 --Beau. & Fl.
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   3. To furnish or equip with weapons of offense or defense;
      as, to arm soldiers; to arm the country.
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            Abram . . . armed his trained servants. --Gen. xiv.
                                                  14.
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   4. To cover or furnish with a plate, or with whatever will
      add strength, force, security, or efficiency; as, to arm
      the hit of a sword; to arm a hook in angling.
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   5. Fig.: To furnish with means of defense; to prepare for
      resistance; to fortify, in a moral sense.
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            Arm yourselves . . . with the same mind. --1 Pet.
                                                  iv. 1.
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   To arm a magnet, to fit it with an armature.
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The Collaborative International Dictionary of English v.0.48:

Arming \Arm"ing\, n.
   1. The act of furnishing with, or taking, arms.
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            The arming was now universal.         --Macaulay.
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   2. (Naut.) A piece of tallow placed in a cavity at the lower
      end of a sounding lead, to bring up the sand, shells,
      etc., of the sea bottom. --Totten.
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   3. pl. (Naut.) Red dress cloths formerly hung fore and aft
      outside of a ship's upper works on holidays.
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   Arming press (Bookbinding), a press for stamping titles and
      designs on the covers of books.
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WordNet (r) 3.0 (2006):

arming
    n 1: the act of equiping with weapons in preparation for war
         [syn: arming, armament, equipping] [ant:
         disarmament, disarming]