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English definition of “gallon”

gallon

noun [C]     /ˈɡælən/ ( abbreviation gal.) MEASURES
in the UK, a unit for measuring the volume of a liquid or gas , equal to approximately 4.55 litres : Fuel tax is to rise by over 25p a gallon.
in the US, a unit for measuring the volume of a liquid , equal to approximately 3.79 litres : The average federally set price of milk is expected to rise 42 cents , to $1.58 a gallon.
(Definition of gallon noun from the Cambridge Business English Dictionary © Cambridge University Press)
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