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Socratic priority of definition

Socrates starts his discussions by prioritizing the search for definitions. In most cases, Socrates initiates his discourse with an expert on a subject by seeking a definition—by asking, for example, what virtue, goodness, justice, or courage is. To establish a definition, Socrates first gathers clear examples of a virtue and then seeks to establish what they had in common. According to Guthrie, Socrates lived in an era when sophists had challenged the meaning of various virtues, questioning their substance; Socrates's quest for a definition was an attempt to clear the atmosphere from their radical skepticism.

Some scholars have argued that Socrates does not endorse the priority of definition as a principle, because they have identified cases where he does not do so. Some have argued that this priority of definition comes from Plato rather than Socrates. Philosopher Peter Geach, accepting that Socrates endorses the priority of definition, finds the technique fallacious. Αccording to Geach, one may know a proposition even if one cannot define the terms in which the proposition is stated.