OÚSIA Magazine
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What is OÚSIA?

Originally introduced by both Plato and Aristotle, οὐσία, or oúsia (pronounced oo-SEE-uh) is a foundational term in Greek philosophy. Plato used oúsia to depict ultimate reality, eternal "being," and the true essence of thing, while Aristotle defined oúsia as "substance" or "essence"—the fundamental reality or property that grounds an individual entity.

Today, it is typically translated as "essence," "substance," or "being." While its meaning has evolved with time—depending on the philosopher or the era—it generally refers to what something is in its most fundamental state—the core reality that remains, even if external appearances change.