/ Dictionary / Index P Peter III: Meaning and Definition of Find definitions for: Peter III Pronunciation: [key] 1728–62, czar of Russia 1762 (husband of Catherine II; father of Paul I). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Peter II Peterborough 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