gallon
nounUK /ˈɡæl.ən/
US /ˈɡæl.ən/
A gallon is a big amount of liquid, like milk or water.
We bought a gallon of milk at the store.
OTHER MEANINGS
2. A unit of volume equal to four quarts in the US.
The car's tank holds about fifteen gallons.
3. A large amount of something.
He drank gallons of water after the race.
4. A unit of volume used in the UK, equal to about 4.5 liters.
In Britain, a gallon of petrol costs more than in the US.