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Homoousian

Homoousian (Greek:...homós, "same" and ousía, "essence, being") is a technical theological term used in discussion of the Christian understanding of God as Trinity. The Nicene Creed describes Jesus as being homooúsios with God the Father — that is, they are of the "same substance" and are equally God. This term, adopted by the First Council of Nicaea, was intended to add clarity to the relationship between Christ and God the Father within the Godhead.
source: Wikipedia
Of or holding to the teaching that God the Father and God the Son are of the same nature [as opposed to being of a "similar" nature (homoiousian)].
source: Webster's New World College Dictionary, 4th Edition
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