ar·ma·ment
 /ˈɑɚməmənt/  noun  ,  pl   -ments
  1 [  noncount  ] : the process of preparing for war by producing and obtaining weapons
   The country's armament will take years.
  — opposite disarmament
  2 armaments [  plural  ] : military weapons that are used to fight a war
   a small nation that is determined to have adequate armaments