Abstract

In this dissertation I explore Plato's views about the nature of language and thought, and their relations to the world. Plato is sometimes thought to hold that meaningful terms do not require referents at all. Others argue that he holds a referential theory of meaning according to which the meaning of a term just is its referent. I reject both of these views, arguing that Plato thinks that a significant term must have a referent but that the referent of a term does not exhaust its signification: there is also a descriptive component. On my view, Plato embraces a mixed account according to which naming and thought are descriptive and object dependent. Moreover, according to Plato, language is prior to thought, and the way the world is---what objects there are---ultimately determines what we can talk and think about. ;I focus on the Cratylus, Theaetetus and Sophist, the dialogues in which Plato develops his most sophisticated discussions of language and thought. In the Cratylus , Plato articulates an account of the signification of names, and he reveals his views about the nature and role of nominal definitions---the clusters of descriptions that linguistically competent speakers have in mind when they use terms from their language. A name signifies a nominal definition by convention; it signifies a real nature by nature. Plato defends an account of the necessary conditions on thought in the Theaetetus where the account of thought Plato ultimately embraces is not, as some have argued, a form of Russellian acquaintance. For Plato, thought is object dependent and at the same time conceptual. The commitment to object dependence and to the fundamental status of the world is evident in all three dialogues, but it is only explicitly defended in the Sophist. Plato argues that discourse and thought are hostage to what there is. Actual, countable objects determine the possible contents of language and thought