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

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

One kilogram, or about 2 pounds, of qatayef has jumped in price from $1.35 last year to more than $5 this month. —Ghada Abdulfattah, The Christian Science Monitor, 3 Apr. 2024

The average person wastes 79 kilograms (174 pounds) of food each year, meaning at least one billion meals of edible food are wasted in households each day, the report found. —Christian Edwards, CNN, 27 Mar. 2024

One example, known as the Snettisham Great Torc, was made from sixty-four threads comprised of over 1 kilogram (or 2.2 pounds) of gold and silver. —Sean Mowbray, Discover Magazine, 12 Mar. 2024

The Atlantic Large Whale Take Reduction Plan, developed in 1997, requires fishers to use weak links, with a maximum breaking strength of 1,700 pounds (771 kilograms), to connect lobster and crab pots to buoys on the surface. —Joshua Reed, The Conversation, 13 Mar. 2024

Carrying hundreds of kilograms of explosives, the glide bombs can smash through the underground bunkers that protect soldiers at the front. —Constant Méheut, New York Times, 5 Mar. 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