What is the meaning of priming?

noun

• The act of making something ready.
• Any igniter that is used to initiate the burning of a propellant.
  • synonyms: fuse, fuze, fusee, fuzee, primer
• The first or preliminary coat of paint or size applied to a surface.
  • synonyms: flat coat, ground, primer, primer coat, priming coat, undercoat

verb

• Insert a primer into (a gun, mine, or charge) preparatory to detonation or firing.
  • usage: "prime a cannon"; "prime a mine"
  • synonyms: prime
• Cover with a primer; apply a primer to.
  • synonyms: prime, ground, undercoat
• Fill with priming liquid.
  • usage: "prime a car engine"
  • synonyms: prime