/ Dictionary / Index T Theodore I: Meaning and Definition of Find definitions for: Theodore I Pronunciation: [key] dieda.d.649, pope 642–649. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Theodore Theodore II Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language