kilogram
- The base unit of mass in the International System of Units (SI), equal to the mass of the International Prototype of the Kilogram, which is nearly equal to the mass of one liter of water. nounThe recipe calls for one kilogram of flour.The package weighs two kilograms.
- A unit of mass equal to 1,000 grams. nounShe bought a kilogram of apples from the market.The newborn baby weighed three kilograms at birth.