Breadcrumb Home > Thesaurus > G Synonyms of gallon Find synonyms for: Noun 1. gallon, gal, United States liquid unit usage: United States liquid unit equal to 4 quarts or 3.785 liters 2. gallon, Imperial gallon, congius, British capacity unit, Imperial capacity unit usage: a British imperial capacity measure (liquid or dry) equal to 4 quarts or 4.545 liters WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of gallon (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: limpid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language