noun (n)

• any instrument or instrumentality used in fighting or hunting(noun.artifact)

  Example:
  He was licensed to carry a weapon.
  

  Synonym:
  arm, weapon system
  

  source: wordnet30
• a means of persuading or arguing(noun.communication)

  Example:
  He used all his conversational weapons.
  

  Synonym:
  artillery
  

  source: wordnet30
• An instrument of offensive of defensive combat; something to fight with; anything used, or designed to be used, in destroying, defeating, or injuring an enemy, as a gun, a sword, etc.(noun)

  source: webster1913