Definition of gallon
: a unit of liquid capacity equal to 231 cubic inches or four quarts — see weight table
Recent Examples of gallon from the Web
The EPA’s new plan will require 4.24 billion gallons of advanced biofuel in 2018, down from 4.28 billion this year and far lower than the 5.25 billion sought by the industry’s leading trade group.
Fox13 reported that about 2.5 gallons of chlorine and muriatic acid had seeped into the water supply.
Missouri’s gas tax rate is among the lowest in the nation, at 17 cents a gallon.
Alabama ranks in the top five of tax raised per gallon of alcohol sold, according to a 2014 Tax Foundation report published by the Washington Post.
However, Kovacs says drinking water by the gallon can put undue stress on your body.
Apply for our credit card and take 10 cents off every gallon of gasoline.
The tanker was carrying about 5,500 gallons of oil, and in a poor region of the country, where people survive on $3 a day, the prospect of free oil drew a crowd.
At some point, the Congressional Budget Office will release its score for the bill, measuring precisely how many gallons of pondwater the bill sucks.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'gallon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of gallon
Middle English galun, galoun, galon, a liquid measure, borrowed from Anglo-French galun, galon, jalon, from Old French jal-, base of jaloie “container for liquids, bucket” (going back to Vulgar Latin *gallēta, of uncertain origin) + -on, diminutive or particularizing suffix, going back to Latin -ō, -ōn-, suffix of persons with a prominent feature ◆Presumed *gallēta (attested as Medieval Latin galeta “wine vessel, liquid measure” in 11th-century texts) has been linked to several classical Greek words for containers, as kálathos “kind of basket, wine cooler,” kēlástra “milk pail” (so glossed by Hesychius), though none of these fit formally; on the other hand, kēlḗtēs, kalḗtēs “sufferer from a hernia” (from kḗlē, kálē “tumor, hernia”; see -cele) fits formally but requires a contextual and semantic leap (“one swollen or ruptured” > “container”?).
First Known Use: 13th centurySee Words from the same year
GALLON Defined for English Language Learners
Definition of gallon for English Language Learners
: a unit of liquid measurement equal to four U.S. quarts or 3.785 liters
: a unit of liquid measurement equal to four British quarts or 4.546 liters
GALLON Defined for Kids
Definition of gallon for Students
: a unit of liquid capacity equal to four quarts (about 3.8 liters)
Medical Definition of gallon
1: a United States unit of liquid capacity equal to four quarts or 231 cubic inches or 3.785 liters
2: a British unit of liquid and dry capacity equal to four quarts or 277.42 cubic inches or 4.544 liters—called also imperial gallon
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