Definition of gallon noun from the Oxford Advanced Learner's Dictionary

  

gallon

 noun
noun
BrE BrE//ˈɡælən//
 
; NAmE NAmE//ˈɡælən//
 
(abbreviation gal.)
 
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a unit for measuring liquid. In the UK, Canada and other countries it is equal to about 4.5 litres; in the US it is equal to about 3.8 litres. There are four quarts in a gallon. Word Origin Middle English: from Anglo-Norman French galon, from the base of medieval Latin galleta, galletum ‘pail, liquid measure’, perhaps of Celtic origin.
See the Oxford Advanced American Dictionary entry: gallon

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