The Collaborative International Dictionary of English v.0.48:

Wonder \Won"der\, n. [OE. wonder, wunder, AS. wundor; akin to D.
   wonder, OS. wundar, OHG. wuntar, G. wunder, Icel. undr, Sw. &
   Dan. under, and perhaps to Gr. ? to gaze at.]
   [1913 Webster]
   1. That emotion which is excited by novelty, or the
      presentation to the sight or mind of something new,
      unusual, strange, great, extraordinary, or not well
      understood; surprise; astonishment; admiration; amazement.
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            They were filled with wonder and amazement at that
            which had happened unto him.          --Acts iii.
                                                  10.
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            Wonder is the effect of novelty upon ignorance.
                                                  --Johnson.
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   Note: Wonder expresses less than astonishment, and much less
         than amazement. It differs from admiration, as now
         used, in not being necessarily accompanied with love,
         esteem, or approbation.
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   2. A cause of wonder; that which excites surprise; a strange
      thing; a prodigy; a miracle. " Babylon, the wonder of all
      tongues." --Milton.
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            To try things oft, and never to give over, doth
            wonders.                              --Bacon.
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            I am as a wonder unto many.           --Ps. lxxi. 7.
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   Seven wonders of the world. See in the Dictionary of Noted
      Names in Fiction.
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The Collaborative International Dictionary of English v.0.48:

Wonder \Won"der\, a.
   Wonderful. [Obs.] --Gower.
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         After that he said a wonder thing.       --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Wonder \Won"der\, adv.
   Wonderfully. [Obs.] --Chaucer.
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The Collaborative International Dictionary of English v.0.48:

Wonder \Won"der\, v. i. [imp. & p. p. Wondered; p. pr. & vb.
   n. Wondering.] [AS. wundrian.]
   [1913 Webster]
   1. To be affected with surprise or admiration; to be struck
      with astonishment; to be amazed; to marvel.
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            I could not sufficiently wonder at the intrepidity
            of these diminutive mortals.          --Swift.
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            We cease to wonder at what we understand. --Johnson.
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   2. To feel doubt and curiosity; to wait with uncertain
      expectation; to query in the mind; as, he wondered why
      they came.
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            I wonder, in my soul,
            What you would ask me, that I should deny. --Shak.
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WordNet (r) 3.0 (2006):

wonder
    n 1: the feeling aroused by something strange and surprising
         [syn: wonder, wonderment, admiration]
    2: something that causes feelings of wonder; "the wonders of
       modern science" [syn: wonder, marvel]
    3: a state in which you want to learn more about something [syn:
       curiosity, wonder]
    v 1: have a wish or desire to know something; "He wondered who
         had built this beautiful church" [syn: wonder, inquire,
         enquire]
    2: place in doubt or express doubtful speculation; "I wonder
       whether this was the right thing to do"; "she wondered
       whether it would snow tonight" [syn: wonder, question]
    3: be amazed at; "We marvelled at the child's linguistic
       abilities" [syn: wonder, marvel]

Moby Thesaurus II by Grady Ward, 1.0:

90 Moby Thesaurus words for "wonder":
   admiration, agonize over, amaze, amazement, assailability,
   astonishing thing, astonishment, awe, be amazed, be astonished,
   be at sea, be innocent of, be uncertain, beat about, bewilderment,
   concern, coquet with, curiosity, cynosure, dabble, doubt, dubiety,
   enchantment, exception, fantasy, fear, feel unsure, ferlie,
   first-rater, flounder, gape, gawk, gaze, gazingstock, genius,
   give up, grope, have no idea, incertitude, know a little, know not,
   know not what, know nothing of, leading light, luminary, marvel,
   marveling, marvelment, miracle, mistrust, nonesuch, not know,
   not rightly know, pass, perplexity, phenomenon, portent, prodigy,
   puzzle over, puzzlement, question, quite a thing, rarity,
   reverence, scratch the surface, sensation, shock, sight, sign,
   skepticism, smatter, something else, spectacle, stand aghast, star,
   stare, stare openmouthed, stunner, superstar, suspicion,
   thrash about, topnotcher, toy with, virtuoso, vulnerability,
   wonder whether, wonderful thing, wonderment, wonderwork,
   wot not of