/ Dictionary / Index T ternion: Meaning and Definition of Find definitions for: ter•ni•on Pronunciation: (tûr'nē-un), [key] — n. a set or group of three; triad. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ternion (Thesaurus) Terni Ternopol Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language