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

Zahra, a 65-year-old housewife and grandmother, said a kilogram (just over 2 pounds) of beef currently costs 7 million rials (about $11), which is expensive for a household that only earns 100 million rials (about $150) per month. —Somayeh Malekian, ABC News, 18 Apr. 2024

Hyundai Like most any EV, the Ioniq 5 N is quite the porker at about 2,205 kilograms (4,860 pounds). —IEEE Spectrum, 17 Apr. 2024

The suppliers threw in a few hundred kilograms of feijoas as well. —Kate Evans Tatsiana Chypsanava, New York Times, 12 Apr. 2024

The weight of $1 million in $100 bills alone is about 22 pounds (10 kilograms), according to testimony from a U.S. Treasury official to Congress. —Sean Murphy, Fortune, 5 Apr. 2024

Contestants had to gather one kilogram of ripe Arabica coffee beans from plants along a slope. —Christopher Kuhagen, Journal Sentinel, 27 Mar. 2024

If the cash were in various denominations, like $5s, $10s and $20s, the weight of $1 million in cash could be closer to 250 pounds (115 kilograms), which could bring the overall weight of last weekend’s haul to a whopping 7,500 pounds (3,400 kilograms), or about 3 1/2 tons (3.18 metric tonnes). —Sean Murphy, Fortune, 5 Apr. 2024

If the cash were in various denominations, like $5s, $10s and $20s, the weight of $1 million in cash could be closer to 250 pounds (115 kilograms), which could bring the overall weight of last weekend's haul to a whopping 7,500 pounds (3,400 kilograms), or about 3 1/2 tons (3.18 metric tonnes). —Sean Murphy, Quartz, 5 Apr. 2024

In that incident, a car filled with 70 kilograms (154 pounds) of explosives blew up next to his motorcade moving along the highway near the city of Nazran. —Bloomberg News, TIME, 5 Apr. 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