/ Dictionary / Index D decimal system: Meaning and Definition of Find definitions for: dec'imal sys"tem Pronunciation: [key] a system of counting or measurement, the units of which are powers of 10: the numerical system in common worldwide use. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. decimalize decimate Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language