1. homoiousian - Noun
2. homoiousian - Adjective
One of the semi-Arians of the 4th century, who held that the Son was of like, but not the same, essence or substance with the Father; -- opposed to homoousian.
Of or pertaining to Homoiousians, or their belief.
Source: Webster's dictionaryThe semi-Arians refused to accept anything less than the "Homoiousion", (see: Homoiousian ), formulary of faith. Source: Internet