The Collaborative International Dictionary of English v.0.48:

Ammunition \Am`mu*ni"tion\, v. t. [imp. & p. p. Ammunitioned;
   p. pr. & vb. n. Ammunitioning.]
   To provide with ammunition.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Ammunition \Am`mu*ni"tion\, n. [F. amunition, for munition,
   prob. caused by taking la munition as l'amunition. See
   Munition.]
   1. Military stores, or provisions of all kinds for attack or
      defense. [Obs.]
      [1913 Webster]

   2. Articles used in charging firearms and ordnance of all
      kinds; as powder, balls, shot, shells, percussion caps,
      rockets, etc.
      [1913 Webster]

   3. Any stock of missiles, literal or figurative.
      [1913 Webster]

   Ammunition bread, shoes, etc., such as are contracted for
      by government, and supplied to the soldiers. [Eng.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

ammunition
    n 1: projectiles to be fired from a gun [syn: ammunition,
         ammo]
    2: any nuclear or chemical or biological material that can be
       used as a weapon of mass destruction
    3: information that can be used to attack or defend a claim or
       argument or viewpoint; "his admission provided ammunition for
       his critics"