Plato's problem
Definition - A Chomskyan term for the problem of how children learn to speak language properly when the examples they derive from experience are so flawed, i.e. the poverty of the stimulus argument.

To solve Plato’s Problem one must explain how children learn to speak a language properly. Chomsky's solution was to introduce the concept of an universal grammar, our innate hardwired-into-the-brain ability to choose proper forms of linguistic expression.

Etymology -
Chomsky coined the term from Plato's Meno dialogue, in which Socrates shows that an uneducated boy is able to — innately — understand complicated geometric principles.

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