nonjur

a. [ F. jurer to swear, or L. jurare, jurari, to swear, fr. L. jus, juris, right, law, justice. See Jury. ] Not swearing allegiance; -- applied to the party in Great Britain that would not swear allegiance to William and Mary, or their successors. [ 1913 Webster ]

n. (Eng. Hist.) One of those adherents of James II. who refused to take the oath of allegiance to William and Mary, or to their successors, after the revolution of 1688; a Jacobite. [ 1913 Webster ]