liter

American  

[lee-ter] / ˈli tər /

especially British, litre

noun

• liters
  plural

1. a unit of capacity redefined in 1964 by a reduction of 28 parts in a million to be exactly equal to one cubic decimeter. It is equivalent to 1.0567 U.S. liquid quarts and is equal to the volume of one kilogram of distilled water at 4°C. l

---

liter British  

/ ˈliːtə /

noun

1. the US spelling of litre

---

liter Scientific  

/ lē′tər /

1. The basic unit of liquid volume or capacity in the metric system, equal to 1.06 quart or 2.12 pints.

2. See Table at measurement

3. The basic unit of dry volume or capacity in the metric system, equal to 0.90 quart or 1.82 pint.

4. See Table at measurement

---

Other Word Forms

Noun Inflected Forms

• liters
  plural

Etymology

Origin of liter

1800–10; < French litre, back formation from litron an old measure of capacity, derivative (with -on noun suffix) of Medieval Latin litra < Greek lítra pound

Compare meaning

How does liter compare to similar and commonly confused words? Explore the most common comparisons:

• gallon vs. liter
• liter vs. milliliter
• pint vs. liter

Explanation

A liter is a liquid unit of measurement. Drinking a liter of water everyday is good for you, though drinking a liter of diet soda probably isn't. A liter is a metric unit that measures volume. You can also spell the word litre, which is actually the most common spelling outside of the United States. Liters most often measure liquids — a large bottle of Coke or Pepsi, for example, typically comes in a two liter size. The French word litre comes from the obsolete litron, which once measured amounts of grain, with its Greek root litra, or "pound."

Example Sentences

See Examples For:

liter liters

On Monday, the government doubled some gasoline prices to the equivalent of $0.04 a liter.

From The Wall Street Journal ● Sep. 11, 2026

Specifically, that 2001 testing showed the carcinogenic solvent and dry-cleaning chemical perchloroethylene, or PCE, in the soil at levels as high as 6,658 micrograms per liter, said Alysa Pakkidis, information officer for the agency.

From Los Angeles Times ● Aug. 11, 2026

But the fuel blockade is hurting business, strangled by power cuts of up to 30 hours at a time, and fuel prices of up to $8 a liter.

From Barron's ● Jul. 3, 2026

Doctors said she lost a liter of blood and her complications were likely worse for having been forced to wait so long to deliver.

From Salon ● May 27, 2026

Also, I'll lose half a liter of water per day to breathing until the humidity in the Hab reaches its maximum and water starts condensing on every surface.

From "The Martian" by Andy Weir

Without adaptive measures, the figure could nearly triple to 644 billion liters by 2030, Rystad estimates.

From Barron's ● Sep. 7, 2026

The most cited recommendations for water come from the National Academy of Medicine, which calls for a total daily fluid intake of 3.7 liters for men and 2.7 liters for women.

From The Wall Street Journal ● Aug. 27, 2026

However, it also causes patients to produce very large amounts of urine, often 6 to 7 liters per day.

From Science Daily ● Jun. 17, 2026

Australia has secured an extra 450 million liters of diesel and an additional 100 million liters of jet fuel by underwriting those cargoes.

From The Wall Street Journal ● May 1, 2026

Humans need three liters of water per day to be comfortable.

From "The Martian" by Andy Weir