gallon - definition and synonyms

noun [countable] 

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  1. a unit for measuring an amount of liquid, especially petrol or water. In the UK, a gallon is equal to 4.55 litres. In the US, a gallon is equal to 3.79 litres. A gallon contains 8 pints or 4 quarts
    gallon of:

    a gallon of petrol