/ Dictionary / Index S supertonic: Meaning and Definition of Find definitions for: su•per•ton•ic Pronunciation: (s"pur-ton'ik), [key] — n. Music. the second tone of a diatonic scale, being the next above the tonic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: supertonic (Thesaurus) supertitle superunification Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language