gal.

/G AO1 L/
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).

    โ€œThe pipe burst and gallons of water flooded into the kitchen.โ€

Source: https://en.wiktionary.org/wiki/gal., https://en.wiktionary.org/wiki/gallon