Definition of kilogram
1
: the base unit of mass in the International System of Units that is defined by setting the fixed numerical value of Planck's constant to 6.62607015 x 10–34 joule seconds — see Metric System Table
2
: a unit of force or weight equal to the weight of a kilogram mass under a gravitational attraction equal to that of the earth
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Merriam-Webster unabridged
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Time Traveler for kilogram
The first known use of kilogram was in 1797
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