the philosophy of Plato or his followers.See Plato.
any of various revivals of Platonic doctrines or related ideas, especially Neoplatonism and Cambridge Platonism (a 17th-century attempt to reconcile Christianity with humanism and science).
the theory that numbers or other abstract objects are objective, timeless entities, independent of the physical world and of the symbols used to represent them.
Derivatives
Platonist
noun
Platonism in other Oxford dictionaries
Definition of Platonism in the US English dictionary