/ Dictionary / Index O Otto III: Meaning and Definition of Find definitions for: Otto III Pronunciation: [key] a.d.980–1002, king of Germany 983–1002; emperor of the Holy Roman Empire 996–1002 (son of Otto II). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Otto II Otto IV Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language