gallon

noun

1. 1

   A unit of volume, equivalent to eight pints

2. 2

   Exactly 4.54609 liters; an imperial gallon

3. 3

   231 cubic inches or approximately 3.785 liters for liquids (a "U.S. liquid gallon")

4. 4

   One-eighth of a U.S. bushel or approximately 4.405 liters for dry goods (a "U.S. dry gallon").

5. 5

   (in the plural) A large quantity (of any liquid).

   “The pipe burst and gallons of water flooded into the kitchen.”