This dissertation explores how prose authors of the Classical period envisioned literary distinctions, particularly how and when they labeled a particular utterance ‘poetic’. The first chapter addresses fifth-century prose authors whose work survives in significant degree (Herodotus, Thucydides), or whose projects are inherently interested in literary categorization (Gorgias). The second chapter continues the investigation, looking now at relevant fourth-century authors who show an explicit interest in literary categories and, especially, the place of poetry (Isocrates, Plato). The final chapter addresses Aristotle’s treatment of poetry. The foundation of the project is a semantic analysis of the language used to describe or single out a wo...