gallon Definition in the Cambridge English Dictionary
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Definition of “gallon” - English Dictionary

Definition of "gallon" - American English Dictionary

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gallonnoun [C]

 us   /ˈɡæl·ən/ (abbreviation gal.)
a ​unit of ​measurement of ​volume of ​liquidequal to 4 ​quarts or 3.78 ​liters
(Definition of gallon from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "gallon" - British English Dictionary

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gallonnoun

uk   us   /ˈɡæl.ən/
[C] a ​unit for ​measuringvolume: How much does a gallon of ​petrolcost? An ​imperial gallon, used in ​Britain, is ​equal to 4,546 ​cubiccentimetres. A US gallon is ​equal to 3,785 ​cubiccentimetres. [C usually plural] informal a ​largeamount of ​liquid: I ​lovemilk - I ​drink gallons of the ​stuff.
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(Definition of gallon from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "gallon" - Business English Dictionary

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gallonnoun [C]

uk   us   /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 from the Cambridge Business English Dictionary © Cambridge University Press)
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