/ Dictionary / Index G gallonage: Meaning and Definition of Find definitions for: gal•lon•age Pronunciation: (gal'u-nij), [key] — n. the number of gallons of something used. the rate at which gallons of something are used. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gallon galloon Related Content Daily Word Quiz: lyceum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language