/ Dictionary / Index B binary digit: Meaning and Definition of Find definitions for: bi'nary dig'it Pronunciation: [key] — Math., Computers. Math.,Computers. either of the digits 0 or 1 when used in the binary number system. bit (def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. binary color binary fission Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language