/ Dictionary / Index D decimal: Meaning and Definition of Find definitions for: dec•i•mal Pronunciation: (des'u-mul, des'mul), [key] — adj. pertaining to tenths or to the number 10. proceeding by tens: a decimal system. —n. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decimal (Thesaurus) decillion decimal classification Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language