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# kilogram

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noun ki·lo·gram \-ˌgram\

## Simple Definition of kilogram

• : a unit of weight equal to 1,000 grams

Source: Merriam-Webster's Learner's Dictionary

## Full Definition of kilogram

1. 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. 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

## Did You Know?

The original concept of the kilogram, as the mass of a cubic decimeter of water (a bit more than a quart), was adopted as the base unit of mass by the new revolutionary government of France in 1793. In 1875, in the Treaty of the Meter, 17 countries, including the U.S., adopted the French kilogram as an international standard. In 1889 a new international standard for the kilogram, a metal bar made of platinum iridium, was agreed to; President Benjamin Harrison officially received the 1-kilogram cylinder for the U.S. in 1890. But no one uses that bar very often; for all practical purposes, a kilogram equals 2.2 pounds.

## Origin and Etymology of kilogram

French kilogramme, from kilo- + gramme gram

First Known Use: 1797

## kilogram

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noun ki·lo·gram \ˈki-lə-ˌgram\

## Definition of kilogram for Students

1. :  a metric unit of weight equal to 1000 grams

noun ki·lo·gram

## Medical Definition of kilogram

1. 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

2. 2:  a unit of force equal to the weight of a kilogram mass under a gravitational attraction equal to that of the earth

## Variants of kilogram

or chiefly British

## kilogramme

\ˈkil-ə-ˌgram, ˈkē-lə-\play play

## Seen and Heard

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#### iota

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a very small amount

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