What is the meaning of cartridge?

noun

• Ammunition consisting of a cylindrical casing containing an explosive charge and a bullet; fired from a rifle or handgun.
• A light-tight supply chamber holding the film and supplying it for exposure as required.
  • synonyms: magazine
• A module designed to be inserted into a larger piece of equipment.
  • usage: "he loaded a cartridge of fresh tape into the tape deck"
• An electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable.
  • synonyms: pickup