† plagiˈarian,a.Obs.rare. [f. as plagiary + -an.] Of or pertaining to plagiaries or man-stealers. 1656Blount Glossogr., Plagiarian Law (plagiaria lex), a law made against these men [plagiaries], &c.1706Phillips, Plagiarian, as The Plagiarian Law; a Law made against Plagiaries.