/ Dictionary / Index S syntonize: Meaning and Definition of Find definitions for: syn•to•nize Pronunciation: (sin'tn-īz"), [key] — -nized, -niz•ing. to render syntonic; tune to the same frequency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. syntonic syntonous Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language