- noun the base unit of mass in the SI system, equal to 1000 grams or 2.2046 pounds.
- The SI unit of mass. It is defined as the mass of a platinum-iridium bar kept by the Bureau International des Poids et Mesures. It is equal to 103, or 1,000 grams. It is the only remaining SI base unit that cannot be determined to a given degree of accuracy by a properly equipped laboratory. Its abbreviation is kg. Also called kilo.
- The common measure of weight approximately equal to 2.2 lbs, divided in grams (g) (1000 g per kg). 1 lb is approximately 454 g and 1 oz approximately 28 g.
- noun an SI unit of measurement of weight equal to 1 000 grams