Homoiousian

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Ho·moi·ou·si·an

H0257400 (hō′moi-o͞o′sē-ən, -zē-)n. An adherent of the Christian doctrine, formulated in the fourth century ad, that Jesus the Son and God the Father are of similar but not of the same substance.
[From Greek homoiousios, of similar substance : homoio-, homeo- + ousiā, substance (from ousa, feminine present participle of einai, to be; see es- in Indo-European roots).]

Homoiousian

(ˌhəʊmɔɪˈuːsɪən; -ˈaʊ-; ˌhɒm-) n (Theology) a Christian who believes that the Son is of like (and not identical) substance with the Father. Compare Homoousianadj (Theology) of or relating to the Homoiousians[C18: from Late Greek homoiousios of like substance, from Greek homoio- like + ousia nature] ˌHomoiˈousianism n

Ho•moi•ou•si•an

(ˌhoʊ mɔɪˈu si ən, -ˈaʊ-)

n. 1. a member of a 4th-century A.D. church party that maintained that the essence of the Son is similar to, but not the same as, that of the Father. adj. 2. of or pertaining to the Homoiousians or their doctrine. [1725–35; < Late Greek homoioúsi(os) of like substance (homoi- homoi(o)- + -ousios, adj. derivative of ousía substance, essence, derivative of ṓn, s. ont-, present participle of eînai to be) + -an1] Ho`moi•ou′si•an•ism, n.