Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old North French
Origin: Medieval Latin galeta 'liquid container, liquid measure'

gallon

 noun
     
Related topics: Measurement
gal‧lon [countable]
1 written abbreviation galTM a unit for measuring liquids, equal to eight pints. In Britain this is 4.55 litres, and in the US it is 3.79 litres:
a 20 gallon fish tank
The car does about 50 miles per gallon.
2 informal a lot of a liquid:
We drank gallons of coffee.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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