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English definition of “gallon”

gallon

noun uk   /ˈɡæl.ən/ us  
[C] a unit for measuring volume: An imperial gallon, used in Britain, is equal to 4,546 cubic centimetres. A US gallon is equal to 3,785 cubic centimetres. [C usually plural] informal a large amount of liquid: I love milk - I drink gallons of the stuff.
(Definition of gallon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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