/ Dictionary / Index C cgs: Meaning and Definition of Find definitions for: cgs Pronunciation: [key] centimeter-gram-second. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cgs (Thesaurus) cGMP ch Related Content Daily Word Quiz: reiterate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language