Merriam-Webster Collegiate Dictionary - kilogram

 noun  Etymology: French ~me, from kilo- + gramme gram  Date: 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 — see metric system table  2. a unit of force or weight equal to the weight of a ~ mass under a gravitational attraction equal to that of the earth KILOGRAM-METER  noun  Date: 1866 the meter-kilogram-second gravitational unit of work and energy equal to the work done by a kilogram force acting through a distance of one meter in the direction of the force ; about 7.235 foot-pounds