The Collaborative International Dictionary of English v.0.48:

Notice \No"tice\, v. t. [imp. & p. p. Noticed; p. pr. & vb. n.
   Noticing.]
   1. To observe; to see; to mark; to take note of; to heed; to
      pay attention to.
      [1913 Webster]

   2. To show that one has observed; to take public note of;
      remark upon; to make comments on; to refer to; as, to
      notice a book.
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            This plant deserves to be noticed in this place.
                                                  --Tooke.
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            Another circumstance was noticed in connection with
            the suggestion last discussed.        --Sir W.
                                                  Hamilton.
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   3. To treat with attention and civility; as, to notice
      strangers.
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   Syn: To remark; observe; perceive; see; mark; note; mind;
        regard; heed; mention. See Remark.
        [1913 Webster]

WordNet (r) 3.0 (2006):

noticed
    adj 1: being perceived or observed; "an easily noticed effect on
           the rate of growth" [ant: unnoticed]