Pronunciation: (kil'u-gram"),[key] —n. 1. a unit of mass equal to 1000 grams: the base SI unit of mass, equal to the mass of the international prototype of the kilogram, a platinum-iridium cylinder kept in Sèvres, France. Abbr.: kg
2. a unit of force and weight, equal to the force that produces an acceleration of 9.80665 meters per second per second when acting on a mass of one kilogram. Abbr.: kg Also,esp. Brit.,kil'o•gramme".