(hō′mō·′sē·ən, -ou′sē-, hom′ō-) adjective
Identical in nature. Also ho′mo·ou′·si·ous.

(hō′mō·′sē·ən, -ou′sē-, hom′ō-) noun
One of the Christians, who, in the great controversy of the fourth century about the nature of Christ, maintained that it was identical with that of the Father, instead of similar, or different, as maintained by the less strict and more rigid Arians respectively: distinguished from Homoiousian and Heterousian.
—adjective Of or pertaining to the Homoousians or their beliefs: also Ho′·mo·ou′si·ous. [<Gk. homos the same + ousia being]
—Ho′mo·ou′si·an·ism noun