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Ousia

Term in ancient Greek philosophy and Christian theology

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Through Philosophy, Essence and Existence

The Ancient Greek term θεία ουσία (theia ousia; divine essence) was translated in Latin as essentia or substantia, and hence in English as essence or substance.

Etymology

The term οὐσία is an Ancient Greek noun, formed on the feminine present participle of the verb εἰμί, eimí, meaning "to be, I am", so similar grammatically to the English noun "being". There was no equivalent grammatical formation in Latin, and it was translated as essentia or substantia. Cicero coined essentia and the philosopher Seneca and rhetorician Quintilian used it as equivalent for οὐσία, while Apuleius rendered οὐσία both as essentia or substantia. In order to designate οὐσία, early Christian theologian Tertullian favored the use of substantia over essentia, while Augustine of Hippo and Boethius took the opposite stance, preferring the use of essentia as designation for οὐσία. Some of the most prominent Latin authors, like Hilary of Poitiers, noted that those variants were often being used with different meanings. Some modern authors also suggest that the Ancient Greek term οὐσία is properly translated as essentia (essence), while substantia has a wider spectrum of meanings.

From οὐσία (essence), philosophical and theological term οὐσιότης (essentiality) was also derived. It was used by Platonists, like Alcinous, as designation for one of the basic properties of divinity or godhead.

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