| Noun | 1. | gal - United States liquid unit equal to 4 quarts or 3.785 litersquart - a United States liquid unit equal to 32 fluid ounces; four quarts equal one gallon bbl, barrel - any of various units of capacity; "a barrel of beer is 31 gallons and a barrel of oil is 42 gallons" | |
| 2. | gal - a unit of gravitational acceleration equal to one centimeter per second per second (named after Galileo) | |
| 3. | gal - alliterative term for girl (or woman)colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech | |