/ Dictionary / Index M MKS: Meaning and Definition of Find definitions for: MKS Pronunciation: [key] meter-kilogram-second. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mk. MKSA Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language