Source : Webster's Revised Unabridged Dictionary (1913)

Supernal \Su*per"nal\, a. [L. supernus, from super above: cf. F.
   supernel. See {Super-}.]
   1. Being in a higher place or region; locally higher; as, the
      supernal orbs; supernal regions. ``That supernal judge.''
      --Shak.

   2. Relating or belonging to things above; celestial;
      heavenly; as, supernal grace.

            Not by the sufferance of supernal power. --Milton.

Source : WordNet®

supernal
     adj 1: being or coming from on high; "interpret the plague as a
            visitation from heaven, a supernal punishment for the
            sins of men" [ant: {infernal}]
     2: of heaven or the spirit; "celestial peace"; "ethereal
        melodies"; "the supernal happiness of a quiet death" [syn:
         {celestial}, {ethereal}]