Source : Webster's Revised Unabridged Dictionary (1913)

Supernaturalism \Su`per*nat"u*ral*ism\, n.
   1. The quality or state of being supernatural;
      supernaturalness.

   2. (Theol.) The doctrine of a divine and supernatural agency
      in the production of the miracles and revelations recorded
      in the Bible, and in the grace which renews and sanctifies
      men, -- in opposition to the doctrine which denies the
      agency of any other than physical or natural causes in the
      case. [Written also {supranaturalism}.]

Source : WordNet®

supernaturalism
     n 1: a belief in forces beyond ordinary human understanding
     2: the quality of being attributed to power that seems to
        violate or go beyond natural forces [syn: {supernaturalness}]