/ Dictionary / Index O Otto I: Meaning and Definition of Find definitions for: Otto I Pronunciation: [key] (“the Great”)a.d. 912–973, king of the Germans 936–973; emperor of the Holy Roman Empire 962–973. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. otto Otto II Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language