Source : Webster's Revised Unabridged Dictionary (1913)

Nonjuring \Non*ju"ring\, 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.