1. An assemblage of the components required to function a weapon once; i.e., ammunition for a gun which contains in a unit assembly all of the components required to function a gun once, and which is loaded into the gun in one operation. (The term was formerly restricted to ammunition for small arms, such as caliber .22 and caliber .30 rifles, with various terms applied to artillery weapon assemblages, such as complete round and fixed shell. However, the term ‘cartridge,’ with suitable modifiers, is now applied to all ammunition meeting the conditions stated.)

2. An explosive item designed to produce gaseous products of combustion under pressure, for performing a mechanical operation other than the common one of expelling a projectile. The item is usually similar to a blank cartridge of small caliber, and the pressure is utilized by a device known as a cartridge actuated device.