/ Dictionary / Index T thitherto: Meaning and Definition of Find definitions for: thith•er•to Pronunciation: (thi"ur-t', i"-, thi'ur-t", i'-), [key] — adv. up to that time; until then. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thither thixotropy Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language