/ Dictionary / Index P Peter I: Meaning and Definition of Find definitions for: Peter I Pronunciation: [key] (“the Great”), 1672–1725, czar of Russia 1682–1725. (Peter Karageorgevich), 1844–1921, king of Serbia 1903–21. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. peter Peter II Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language