/ Dictionary / Index S SG: Meaning and Definition of Find definitions for: SG Pronunciation: [key] senior grade. Secretary General. Solicitor General. Surgeon General. sg Pronunciation: [key] singular. s.g. Pronunciation: [key] specific gravity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sg (Thesaurus) sfz sgabello Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language