Mid 16th century; earliest use found in James Sanford (fl. 1567–1582), translator. From either classical Latin Platōn or ancient Greek Πλάτων, the name of Plato + -ian. Compare Hellenistic Greek Πλατώνειος, adjective.
Definition of Platonian in US English:
Platonian
noun
Platonist.
adjective
Platonic.
Origin
Mid 16th century; earliest use found in James Sanford (fl. 1567–1582), translator. From either classical Latin Platōn or ancient Greek Πλάτων, the name of Plato + -ian. Compare Hellenistic Greek Πλατώνειος, adjective.