\Sem`i-A"ri*an\, n. [See {Arian}.] (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.