Source : Webster's Revised Unabridged Dictionary (1913)

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

   2. Supernatural; wonderful.

   3. Wonder-working. ``The miraculous harp.'' --Shak. --
      {Mi*rac"u*lous*ly}, adv. -- {Mi*rac"u*lous*ness}, n.

Source : WordNet®

miraculous
     adj 1: being or having the character of a miracle [syn: {marvelous},
             {marvellous}]
     2: peculiarly fortunate or appropriate; as if by divine
        intervention; "a heaven-sent rain saved the crops"; "a
        providential recovery" [syn: {heaven-sent}, {providential}]