/ Dictionary / Index I Ivan III: Meaning and Definition of Find definitions for: Ivan III Pronunciation: [key] — (“Ivan the Great”) 1440–1505, grand duke of Muscovy 1462–1505. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ivan Ivan IV Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language