Breadcrumb Home > Dictionary > Index P Plato: Meaning and Definition of Find definitions for: Pla•to Pronunciation: (plā'tō), [key] — n. 427–347b.c.,Greek philosopher. a walled plain in the second quadrant of the face of the moon, having a dark floor: about 60 miles (96 km) in diameter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plato (Thesaurus) platitudinous Platonic TrendingHere are the facts and trivia that people are buzzing about. Did Birds Evolve from Dinosaurs? The Twelve Dancing Princesses Current Events This Week: January 2023 African Americans by the Numbers Andersen's Fairy Tales: Contents The Celtic Twilight: A Teller of Tales ✖ Related Content Daily Word Quiz: saturnine Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language