Plato play biographical name Pla·to \ˈplā-(ˌ)tō\ Definition of Plato ca 428–348(or 347) b.c. Greek philos. Writing? Check your grammar now! Learn More about plato Spanish Central: Translation of Plato Britannica English: Translation of Plato for Arabic speakers Britannica.com: Encyclopedia article about Plato Seen and Heard What made you want to look up Plato? Please tell us where you read or heard it (including the quote, if possible).