Ivan III iva·niii uncommon noun 1. grand duke of Muscovy whose victories against the Tartars laid the basis for Russian unity (1440-1505) SynonymsIvan IIIIvan III VasilievichIvan the Great Related words Word family Ivan III Vasilievich Broader terms grand duke WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.
