The Collaborative International Dictionary of English v.0.48:

Miraculous \Mi*rac"u*lous\, a. [F. miraculeux. See Miracle.]
   [1913 Webster]
   1. Of the nature of a miracle; performed by supernatural
      power; effected by the direct agency of almighty power,
      and not by natural causes.
      [1913 Webster]

   2. Supernatural; wonderful.
      [1913 Webster]

   3. Wonder-working. "The miraculous harp." --Shak.
      [1913 Webster] -- Mi*rac"u*lous*ly, adv. --
      Mi*rac"u*lous*ness, n.
      [1913 Webster]