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Homoousian
Homoousian Ho`mo*ou"si*an, a.
Of or pertaining to the Homoousians, or to the doctrines they
held.
Homoousian
Homoousian Ho`mo*ou"si*an, n. [Gr. ?; ? the same + ? being,
essence, substance.] (Eccl. Hist.)
One of those, in the 4th century, who accepted the Nicene
creed, and maintained that the Son had the same essence or
substance with the Father; -- opposed to homoiousian.
Meaning of Homoousians from wikipedia