Source : Webster's Revised Unabridged Dictionary (1913)

Justiciary \Jus*ti"ci*a*ry\, n. [Cf. LL. justitiarius, F.
   justicier. See {Justice}.] (Old Eng. Law)
   An old name for the judges of the higher English courts.

   Note: The chief justiciary, or justiciar, in early English
         history, was not only the chief justice of the kingdom,
         but also ex officio regent in the king's absence.

   {Court of justiciary} (Scots Law), the supreme criminal
      court, having jurisdiction over the whole of Scotland.

Source : WordNet®

justiciary
     n 1: formerly a high judicial officer [syn: {justiciar}]
     2: the jurisdiction of a justiciar