- a large wine bottle having a capacity of two ordinary bottles or 1.5 liters (1.6 quarts).
- a magnum cartridge or firearm.
- (of a cartridge) equipped with a larger charge than other cartridges of the same size.
- (of a firearm) using such a cartridge.
- unusually great in power or size: a magnum spotlight; a magnum dosage.
- a wine bottle holding the equivalent of two normal bottles (approximately 52 fluid ounces)
