A-cā'ci-an, n.

(a-kā'shĭ-an), n. (Eccl. Hist.) One of a sect in the early church, so called from their leaders, Acacius, bishop of Cæsarea, and Acacius, patriarch of Constantinople. Some of them maintained that the Son was only a similar, not the same, substance with the Father; others, that he was not only a distinct but a dissimilar substance.