Definition of “gallon” - English Dictionary

“gallon” in British English

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gallonnoun

uk /ˈɡæl.ən/ us /ˈɡæl.ən/

[ C ] a unit for measuring volume:

How much does a gallon of petrol cost?
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.

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(Definition of “gallon” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“gallon” in American English

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gallonnoun [ C ]

us /ˈɡæl·ən/ abbreviation gal.

a unit of measurement of volume of liquid equal to 4 quarts or 3.78 liters

(Definition of “gallon” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“gallon” in Business English

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gallonnoun [ C ]

uk /ˈɡælən/ us 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)