| 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. Abbreviation: 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. Abbreviation: kg |
A unit of mass in the metric system, equal to one thousand grams. The weight of a one-kilogram mass is slightly over two pounds.
kilogram kil·o·gram (kĭl'ə-grām')
n.
Abbr. kg The base unit of mass in the International System of Units, equal to 1,000 grams (2.2046 pounds).