Definition of gallon

  1. gallon Noun A unit of volume, equivalent to eight pints
  2. gallon Noun exactly 4.54609 liters; an imperial "gallon"
  3. gallon Noun 231 cubic inches or approximately 3.785 liters for liquids (a "U.S. liquid "gallon")
  4. gallon Noun one-eighth of a U.S. bushel or approximately 4.405 liters for dry goods (a "U.S. dry "gallon").
  5. gallon Noun A large quantity (of any liquid).
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