Definition of gallon noun from the Oxford Advanced American Dictionary

  

gallon

 noun
noun
NAmE//ˈɡælən//
 
(abbreviation gal.)
 
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 a unit for measuring liquid. In the U.S. it is equal to about 3.8 liters. In Canada, the U.K., and other countries it is equal to about 4.5 liters. There are four quarts in a gallon.
See the Oxford Advanced Learner's Dictionary entry: gallon

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