n. 1. Abbr. gal. a. A unit of volume in the US Customary System, used in liquid measure, equal to 4 quarts (3.785 liters). b. A unit of volume in the British Imperial System, used in liquid and dry measure, equal to 4 quarts (4.546 liters). See Table at measurement. 2. a. A container with a capacity of one gallon. b. The contents of such a container. [Middle English, a liquid measure, from Old North French galon.] |
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