kilogram

[kil-uh-gram]
noun
1.
a unit of mass equal to 1000 grams: the basic unit of mass in the International System of Units (SI), equal to the mass of the international prototype of the kilogram, a platinum-iridium cylinder kept in Sèvres, France. Abbreviation: kg
2.
a unit of force and weight, equal to the force that produces an acceleration of 9.80665 meters per second per second when acting on a mass of one kilogram. Abbreviation: kg
Also, especially British, kilogramme.


Origin:
1790–1800; < French kilogramme. See kilo-, -gram2

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World English Dictionary
kilogram (ˈkɪləʊˌɡræm)
 
n
1.  one thousand grams
2.  the basic SI unit of mass, equal to the mass of the international prototype held by the Bureau International des Poids et Mesures. One kilogram is equivalent to 2.204 62 pounds

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American Heritage
Medical Dictionary

kilogram kil·o·gram (kĭl'ə-grām')
n.

Abbr. kg The base unit of mass in the International System of Units, equal to 1,000 grams (2.2046 pounds).

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
kilogram   (kĭl'ə-grām')  Pronunciation Key 
The basic unit of mass in the metric system, equal to 1,000 grams (2.2 pounds). See Table at measurement.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
kilogram [(kil-uh-gram, kee-luh-gram)]

A unit of mass in the metric system, equal to one thousand grams. The weight of a one-kilogram mass is slightly over two pounds.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

kilogram

basic unit of mass in the metric system, equal to the mass of the international prototype of the kilogram, a platinum-iridium cylinder kept at the International Bureau of Weights and Measures laboratory at Sevres, France. A kilogram is very nearly equal (it was originally intended to be exactly equal) to the mass of 1,000 cubic cm of water. The pound is now defined as equal to 0.45359237 kg, exactly. As originally defined, the kg was represented in the late 18th century as a solid cylinder of platinum. Measurements of the mass of a volume of water proved to be imprecise and inconvenient to make, however, and the platinum artifact itself became the standard. It was superseded in 1889 by the present standard kilogram, also a solid cylinder, of height equal to its diameter, made of the same alloy as the standard metre bar then in use. See also International System of Units.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Every extra kilogram that the craft weighs piles on the dollars in the form of
  launch costs.
Generally the lethal dose is measured in grams per kilogram.
One kilogram of hydrogen is considered equivalent to one gallon of gasoline.
Getting a kilogram of anything into orbit costs thousands of dollars.
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