- Homoiousian⇄adj. relating to or maintaining likeness of substance between the Father and the Son.
- Homoiousian⇄Homoiousian, adjective, noun.
(Theology.) - Homoiousian⇄noun a member of a church party of the 300's that maintained that the essence of the Son is similar to, but not identical with, that of the Father.