/ Dictionary / Index D diatonic: Meaning and Definition of Find definitions for: di•a•ton•ic Pronunciation: (dī"u-ton'ik), [key] — adj. Music. noting those scales that contain five whole tones and two semitones, as the major, minor, and certain modal scales. of or pertaining to the tones, intervals, or harmonies of such scales. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diatonic (Thesaurus) diatomic diatonicism Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language