Etymology
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liter (n.)

unit of capacity in the metric system, 1797, from French litre (1793), from litron, name of an obsolete French measure of capacity for grain (16c.), from Medieval Latin litra, from Greek litra "pound" (unit of weight), which apparently is from the same Sicilian Italic source as Latin libra (see Libra).

updated on August 02, 2016

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Definitions of liter from WordNet

liter (n.)
a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimeters (or approximately 1.75 pints);
Synonyms: litre / l / cubic decimeter / cubic decimetre
From wordnet.princeton.edu, not affiliated with etymonline.