Used attributively before another noun to indicate a weight or quantity of one kilogram.
Definitions
kilogramnoun
The base unit of mass in the International System of Units (SI), defined exactly as the mass of the international prototype kilogram (now fixed via the Planck constant), equal to 1,000 grams.
Under the SI, the kilogram is the only base unit still defined in terms of a physical constant.
Informally, a quantity of something that weighs one kilogram.