kilogram

noun

ki·​lo·​gram ˈki-lə-ˌgram  ˈkē-lə- 

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

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.

Examples of kilogram in a Sentence

Recent Examples on the Web

Advertisement California Nearly 3,000 pounds of methamphetamine found in carrot shipment at U.S.-Mexico border March 25, 2024 All told, authorities seized more than 1,000 kilograms — the equivalent of more than 2,200 pounds — of meth embedded in these shipping containers. —Rosanna Xia, Los Angeles Times, 10 Aug. 2024

Reeves lifted 117 kilograms (390 pounds) in the snatch and 145kg (320 pounds) in the clean and jerk for a total of 262kg to beat Mari Leivis Sanchez of Colombia by five kilograms in the women's 71kg division. —CBS News, 9 Aug. 2024

In a report last year, NASA's Orbital Debris Program Office said the Long March 6A upper stage has a mass of about 5,800 kilograms (12,800 pounds) without kerosene and liquid oxygen propellants. —Stephen Clark, Ars Technica, 9 Aug. 2024

On average, each acre that is cultivated yields about 2 tons (1,800 kilograms) of rice. —Jehangir Bhadha, The Conversation, 8 Aug. 2024

Word History

Etymology

French kilogramme, from kilo- + gramme gram

First Known Use

1797, in the meaning defined at sense 1

Phrases Containing kilogram

• kilogram-meter
• meter-kilogram-second

Kids Definition

kilogram

noun

ki·​lo·​gram ˈkē-lə-ˌgram  ˈkil-ə- 

1

: the basic unit of mass in the metric system that has been accepted by international agreement and is nearly equal to the mass of 1000 cubic centimeters of water at its highest density see metric system

2

: the weight of a kilogram mass on the earth

he weighs 80 kilograms

see metric system

Medical Definition

kilogram

noun

ki·​lo·​gram

variants or chiefly British kilogramme

ˈkil-ə-ˌgram  ˈkē-lə- 

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

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