The Collaborative International Dictionary of English v.0.48:

Munition \Mu*ni"tion\, n. [F., munition of war, L. munitio a
   fortifying, fortification, fr. munire to fortify, defend with
   a wall; cf. moenia walls, murus (for moirus) a wall, and Skr.
   mi to fix, make firm. Cf. Ammunition.]
   1. Fortification; stronghold. [Obs.]
      [1913 Webster]

            His place of defense shall be the munitions of
            rocks.                                --Is. xxxiii.
                                                  16.
      [1913 Webster]

   2. Whatever materials are used in war for defense or for
      annoying an enemy; ammunition; also, stores and
      provisions; military stores of all kinds.
      [1913 Webster]

            The bodies of men, munition, and money, may justly
            be called the sinews of war.          --Sir W.
                                                  Raleigh.
      [1913 Webster]

WordNet (r) 3.0 (2006):

munition
    n 1: weapons considered collectively [syn: weaponry, arms,
         implements of war, weapons system, munition]
    2: military supplies [syn: munition, ordnance, ordnance
       store]
    3: defensive structure consisting of walls or mounds built
       around a stronghold to strengthen it [syn: fortification,
       munition]
    v 1: supply with weapons

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "munition":
   accouter, appoint, arm, dress, equip, fit, fit out, fit up,
   furnish, gear, heel, man, outfit, prepare, rig, rig out, rig up,
   staff, turn out