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imperial gallon

noun
  1. a British gallon used in liquid and dry measurement equivalent to 1.2 U.S. gallons, or 4.54 liters.
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Origin of imperial gallon

First recorded in 1830–40
Also called British gallon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for imperial gallon

imperial gallon

noun
  1. a formal name for gallon (def. 1)
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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