Ar·i·an 1 (âr??-?n, ?r?-)adj.1. Of or relating to Arianism: the Arian heresy.2. Of or relating to Arius.n. A believer in Arianism.Ar·i·an 2 (?r??-?n, âr?-)n. One who is born under the sign of Aries.Ar?i·an adj.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Arian (???r??n) adj (Theology) of, relating to, or characterizing Arius or Arianismn (Theology) an adherent of Arianismadj, n (Peoples) a variant spelling of AryanCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Ar?i?an (???r i ?n, ?ær-) adj. 1. of or pertaining to Arius or Arianism. n. 2. an adherent of Arianism. [1525?35;