Other forms: liters
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."