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gallon

[gal-uh n]
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noun
  1. a common unit of capacity in English-speaking countries, equal to four quarts, the U.S. standard gallon being equal to 231 cubic inches (3.7853 liters), and the British imperial gallon to 277.42 cubic inches (4.546 liters). Abbreviation: gal.
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Origin of gallon

1250–1300; Middle English galo(u)n, gallon < Old North French galon, derivative from base of Medieval Latin gallēta jug, bucket, of uncertain origin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for gallon

gallon

noun
  1. Also called: imperial gallon British a unit of capacity equal to 277.42 cubic inches. 1 Brit gallon is equivalent to 1.20 US gallons or 4.55 litres
  2. US a unit of capacity equal to 231 cubic inches. 1 US gallon is equivalent to 0.83 imperial gallon or 3.79 litres
  3. (plural) great quantities
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Word Origin

C13: from Old Northern French galon (Old French jalon), perhaps of Celtic origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for gallon

n.

liquid measure, late 13c., from Old North French galon, corresponding to Old French jalon "liquid measure," related to jale "bowl," from Medieval Latin diminutive form galleta "bucket, pail," also "a measure of wine," of unknown origin, perhaps from Gaulish galla "vessel."

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Online Etymology Dictionary, © 2010 Douglas Harper

gallon in Medicine

gallon

(gălən)
n.
  1. A unit of volume in the US Customary System, used in liquid measure, equal to 4 quarts, 231 cubic inches, or 8.3389 pounds of distilled water (3.7853 liters).
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

gallon in Science

gallon

[gălən]
  1. A unit of liquid volume or capacity in the US Customary System equal to 4 quarts (3.79 liters). See Table at measurement.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.