Source : Webster's Revised Unabridged Dictionary (1913)

Kilogram \Kil"o*gram\, Kilogramme \Kil"o*gramme\, n. [F.
   kilogramme; pref. kilo- (fr. Gr. chi`lioi a thousand ) +
   gramme. See 3d {Gram}.]
   A measure of weight, being a thousand grams, equal to 2.2046
   pounds avoirdupois (15,432.34 grains). It is equal to the
   weight of a cubic decimeter of distilled water at the
   temperature of maximum density, or 39[deg] Fahrenheit.

Source : WordNet®

kilogram
     n : one thousand grams; the basic unit of mass adopted under the
         Systeme International d'Unites; "a kilogram is
         approximately 2.2 pounds" [syn: {kg}, {kilo}]