ETYM OF galon, jalon, Late Lat. galo, galona, from galum a liquid measure; cf. French jale large bowl. Related to Gill a measure.
1. United States liquid unit equal to 4 quarts or 3.785 liters; SYN. gal.
2. A British imperial capacity measure (liquid or dry) equal to 4 quarts or 4.545 liters; SYN. Imperial gallon, congius.
Unit of liquid measure, equal to 3.785 liters, and subdivided into four quarts or eight pints. The UK and Canadian imperial gallon is equivalent to 4.546 liters.