Imperial gallon definitions

Imperial gallon

congius noun a British imperial capacity measure (liquid or dry) equal to 4 quarts or 4.545 liters
Found on https://www.encyclo.co.uk/local/20974

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imperial gallon

a British gallon equivalent to 1 U.S. gallons, or 277.42 cubic inches.
Found on https://www.infoplease.com/dictionary/imperial-gallon

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