[ki.lo.gram] n [F kilogramme, fr. kilo- + gramme gram] (1797) 1: the base unit of mass in the International System of Units that is equal to the mass of a prototype agreed upon by international convention and that is nearly equal to the mass of 1000 cubic centimeters of water at the temperature of its maximum density
2: a unit of force equal to the weight of a kilogram mass under a gravitational attraction equal to that of the earth