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.
          [1913 Webster]

   Syn: Counsel; suggestion; recommendation; admonition;
        exhortation; information; notice.
        [1913 Webster]

WordNet (r) 3.0 (2006):

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

Moby Thesaurus II by Grady Ward, 1.0:

61 Moby Thesaurus words for "advice":
   admonition, advisement, alerting, broadcast journalism, caution,
   cautioning, clue, communication, communique, counsel, cue,
   direction, dispatch, embassy, express, forewarning, guidance,
   information, instruction, intelligence, journalism, letter,
   message, monition, news, news agency, news medium, news service,
   newsiness, newsletter, newsmagazine, newspaper, newsworthiness,
   notice, notification, office, opinion, passing word, pneumatogram,
   pointer, press association, radio, recommendation, release,
   reportage, steer, suggestion, teaching, telegram, telegraph agency,
   television, the fourth estate, the press, tidings, tip, tip-off,
   view, warning, whisper, wire service, word



Bouvier's Law Dictionary, Revised 6th Ed (1856):

ADVICE, com. law. A letter containing information of any circumstances
unknown to the person to whom it is written; when goods are forwarded by sea
or land, the letter transmitted to inform the consignee of the fact, is
termed advice of goods, or letter of advice.  When one merchant draws upon
another, he generally advises him of the fact.  These letters are intended
to give notice of the facts they contain.



Bouvier's Law Dictionary, Revised 6th Ed (1856):

ADVICE, practice. The opinion given by counsel to their clients; this should
never be done but upon mature deliberation to the best of the counsel's
ability; and without regard to the consideration whether it will affect the
client favorably or unfavorably.



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