/ Dictionary / Index S S gauge: Meaning and Definition of Find definitions for: S gauge Pronunciation: [key] a model railroad gauge of in. (2.2 cm). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sgabello sgd. Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language