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Ousia (Οὐσία) is the Ancient Greek noun formed on the feminine present participle of εἶναι (to be); it is analogous to the English participle being, and the modern philosophy adjectival ontic. Ousia is often translated (sometimes incorrectly) to Latin as substantia and essentia, and to English as substance and essence; and (loosely) also as (contextually) the Latin word accident — which conflicts with the denotation of symbebekós, given that Aristotle uses symbebekós in showing that inhuman things (objects) also are substantive.
The Greek philosophers Plato and Aristotle used ousia in their ontologies; their denotations are the contemporary philosophic and theological usages. Aristotle used ousia in creating animal phyla in biology, ousia denoting that which is shared: essence, form, and nature, and hypostasis denoting that which is particular: an individual instance or thing.[verification needed][dubious ][citation needed]
Much later, Martin Heidegger said that the original meaning of the word ousia was lost in its translation to the Latin, and, subsequently, in its translation to modern languages. For him, ousia means Being, not substance, that is, not some thing or some being that "stood"(-stance) "under"(sub-). Moreover, he also uses the bi-nomial parousia-apousia, denoting presence-absence, and hypostasis denoting existence.
Origen, (d. 251) used ousia in defining God as one genus of ousia, while being three, distinct species of hypostasis: the Father, the Son, and the Holy Spirit. The Synods of Antioch condemned the word homoousios (same substance) because it originated in pagan Greek philosophy. The Paul of Samosata entry of the Catholic Encyclopedia says:
The general agreed upon meaning of ousia in Eastern Christianity is all that subsist by itself and which has not its being in another. In contrast to hypostasis which is used to mean reality or existence.
In 325, the First Council of Nicaea condemned Arianism and formulated a creed, which stated that in the Godhead the Son was Homoousios (same in substance) of the Father. However, controversy did not stop and many Eastern clerics rejected the term because of its earlier condemnation in the usage of Paul of Samosata. Subsequent Emperors Constantius II and Valens supported Arianism and theologians came up with alternative wordings like Homoios (similar) homoiousios (similar in substance), or Anomoios (unsimilar). While the Homoios achieved the support of several councils and the Emperors, those of an opposing view were suppressed. The adherents of the Homoiousios eventually joined forces with the (mostly Western) adherents of the Homoousios and accepted the formulation of the Nicene creed.