Sem·i-A·ri·an n. Eccl. Hist. A member of a branch of the Arians which did not acknowledge the Son to be consubstantial with the Father, that is, of the same substance, but admitted him to be of a like substance with the Father, not by nature, but by a peculiar privilege.
Sem·i-A·ri·an, a. Of or pertaining to Semi-Arianism.
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