Plato

Plato was an ancient Greek philosopher whose dialogues shaped Western philosophy and whose school in Athens was called the Academy.

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Platonic dialogue: A philosophical work written as a conversation among characters, often featuring Socrates. Plato uses dramatic exchanges to test claims rather than present a single treatise.
Allegory of the Cave: A story in Plato’s Republic about prisoners mistaking shadows for reality and a painful ascent toward understanding. It dramatizes education as a reorientation toward what is real.
Socrates: An Athenian philosopher known chiefly through accounts by Plato and other ancient writers. Socrates is the principal speaker and intellectual model in many Platonic dialogues.
Neoplatonism: A philosophical tradition that developed Plato’s ideas into a hierarchical account of reality and its source. Neoplatonists transformed Platonic metaphysics into a powerful late antique system.
Aristotelianism: A philosophical tradition based on Aristotle’s works, emphasizing substance, causes, and systematic inquiry. Aristotle rejects separate Forms and offers a rival account of things and knowledge.
Socratic method: A method of inquiry that tests beliefs through questions, answers, and examination of assumptions. Socrates’ questioning drives many dialogues attributed to Plato.
Analogy of the Sun: An analogy in the Republic comparing the Form of the Good to the sun’s role in sight and growth. It introduces the Good as the source of intelligibility and knowledge.
Peloponnesian War: A prolonged conflict between Athens and Sparta and their allies from 431 to 404 BCE. Plato’s political thought took shape amid Athens’s defeat and civic instability.
Platonism: A family of philosophical positions shaped by Plato’s doctrines, especially the reality of abstract Forms. Later thinkers adapted, revised, and disputed Plato’s account of intelligible reality.
Cynicism: An ancient Greek philosophical movement that advocated virtue through self-sufficiency and rejection of convention. Cynic simplicity challenges the social hierarchy and political design of Plato’s ideal city.