The Collaborative International Dictionary of English v.0.48:

Caution \Cau"tion\, n. [F. caution a security, L. cautio, fr.
   cavere (For scavere) to be on one's guard, to take care
   (orig.) to be on the watch, see; akin to E. show.]
   1. A careful attention to the probable effects of an act, in
      order that failure or harm may be avoided; prudence in
      regard to danger; provident care; wariness.
      [1913 Webster]

   2. Security; guaranty; bail. [R.]
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            The Parliament would yet give his majesty sufficient
            caution that the war should be prosecuted.
                                                  --Clarendon.
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   3. Precept or warning against evil of any kind; exhortation
      to wariness; advice; injunction.
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            In way of caution I must tell you.    --Shak.
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   4. (Civil & Scots Law) A pledge, bond, or other security for
      the performance of an obligation either in or out of
      judicial proceedings; the promise or contract of one not
      for himself but another; security.
      [Webster 1913 Suppl.]

   Caution money, money deposited by way of security or
      guaranty, as by a student at an English university.

   Syn: Care; forethought; forecast; heed; prudence;
        watchfulness; vigilance; circumspection; anxiety;
        providence; counsel; advice; warning; admonition.
        [1913 Webster]