Webster's English Dictionary

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kilogram

Cross references:
  1. metric system         
 
kilo.gram \'kil-*-.gram\ n [F kilogramme, fr. kilo- + gramme gram] 1: the 
   basic metric unit of mass and weight equal to the mass of a platinum 
   -iridium cylinder kept at the International Bureau of Weights and Measures 
   near Paris and nearly equal to 1000 cubic centimeters of water at the 
   temperature of its maximum density 2: a unit of force equal to the weight 
   of a kilogram under standard gravity