The Collaborative International Dictionary of English v.0.48:

Advice \Ad*vice"\, n. [OE. avis, F. avis; ? + OF. vis, fr. L.
   visum seemed, seen; really p. p. of videre to see, so that
   vis meant that which has seemed best. See Vision, and cf.
   Avise, Advise.]
   1. An opinion recommended or offered, as worthy to be
      followed; counsel.
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            We may give advice, but we can not give conduct.
                                                  --Franklin.
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   2. Deliberate consideration; knowledge. [Obs.]
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            How shall I dote on her with more advice,
            That thus without advice begin to love her? --Shak.
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   3. Information or notice given; intelligence; as, late
      advices from France; -- commonly in the plural.
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   Note: In commercial language, advice usually means
         information communicated by letter; -- used chiefly in
         reference to drafts or bills of exchange; as, a letter
         of advice. --McElrath.
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   4. (Crim. Law) Counseling to perform a specific illegal act.
      --Wharton.
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   Advice boat, a vessel employed to carry dispatches or to
      reconnoiter; a dispatch boat.

   To take advice.
      (a) To accept advice.
      (b) To consult with another or others.
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   Syn: Counsel; suggestion; recommendation; admonition;
        exhortation; information; notice.
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WordNet (r) 3.0 (2006):

advice
    n 1: a proposal for an appropriate course of action

The Devil's Dictionary (1881-1906):

ADVICE, n.  The smallest current coin.

    "The man was in such deep distress,"
    Said Tom, "that I could do no less
    Than give him good advice."  Said Jim:
    "If less could have been done for him
    I know you well enough, my son,
    To know that's what you would have done."
                                                         Jebel Jocordy