noun (n)

• the act of making something ready(noun.act)

  source: wordnet30
• any igniter that is used to initiate the burning of a propellant(noun.artifact)

  Synonym:
  fuse, fusee, fuze, fuzee, primer
  

  source: wordnet30
• the first or preliminary coat of paint or size applied to a surface(noun.artifact)

  Synonym:
  flat coat, ground, primer, primer coat, priming coat, undercoat
  

  source: wordnet30
• The powder or other combustible used to communicate fire to a charge of gunpowder, as in a firearm.(noun)

  source: webster1913