noun

• A bottle containing 1.5 liters of fluid, double the volume of a standard wine bottle.
• (firearms) A powerful firearm cartridge, often derived from a shorter, less powerful cartridge calibre that uses the same bullet.
• (by extension) A handgun that fires a cartridge of this calibre; chiefly a revolver, but rarely an autoloader firing an unusually powerful calibre.
• A bottle of Magnum Tonic Wine, a fermented mead drink popular among Jamaicans and other Caribbean peoples for its intoxicating effects, vitamins and use as a purported sexual stimulant. The drink is highly associated with dancehall music and Jamaican pop culture.