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Etymology · Ancient Greek

οὐσία

3 English words descend from Ancient Greek οὐσία, most common first.

essenceThe inherent nature of a thing or idea.
ousiaThe essential nature or ‘substance’ of God, often as contrasted to the ‘energies’ (external actions and influences) through which he is manifest.
usiarchA spiritual being, entity, or divine intellect that rules, governs, or gives shape to a specific realm of existence or level of being.