The Collaborative International Dictionary of English v.0.48:

Marvel \Mar"vel\, n. [OE. mervaile, F. merveille, fr. L.
   mirabilia wonderful things, pl., fr. mirabilis wonderful, fr.
   mirari to wonder or marvel at. See Admire, Smile, and cf.
   Miracle.]
   1. That which causes wonder; a prodigy; a miracle.
      [1913 Webster]

            I will do marvels such as have not been done. --Ex.
                                                  xxxiv. 10.
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            Nature's sweet marvel undefiled.      --Emerson.
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   2. Wonder. [R.] "Use lessens marvel." --Sir W. Scott.
      [1913 Webster] marvel of Peru

The Collaborative International Dictionary of English v.0.48:

Marvel \Mar"vel\, v. i. [imp. & p. p. Marveledor Marvelled;
   p. pr. & vb. n. Marveling or Marvelling.] [OE. merveilen,
   OF. merveillier.]
   To be struck with surprise, astonishment, or wonder; to
   wonder.
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         Marvel not, my brethren, if the world hate you. --1
                                                  john iii. 13.
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The Collaborative International Dictionary of English v.0.48:

Marvel \Mar"vel\, v. t.
   1. To marvel at. [Obs.] --Wyclif.
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   2. To cause to marvel, or be surprised; -- used impersonally.
      [Obs.]
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            But much now me marveleth.            --Rich. the
                                                  Redeless.
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WordNet (r) 3.0 (2006):

marvel
    n 1: something that causes feelings of wonder; "the wonders of
         modern science" [syn: wonder, marvel]
    v 1: be amazed at; "We marvelled at the child's linguistic
         abilities" [syn: wonder, marvel]
    2: express astonishment or surprise about something

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "marvel":
   admiration, amaze, amazement, astonishing thing, astonishment,
   astoundment, awe, be amazed, be astonished, beaut, beguilement,
   bewilderment, breathless wonder, curiosity, dumbfoundment,
   exception, eyeful, fascination, gape, gawk, gaze, gazingstock,
   knockout, looker, lovely, marveling, marvelment, miracle, nonesuch,
   phenomenon, portent, prodigy, puzzlement, quite a thing, rarity,
   sensation, sense of mystery, sense of wonder, sight,
   something else, spectacle, stand aghast, stare, stare openmouthed,
   stunner, stupefaction, surprise, wonder, wonderful thing,
   wonderment