\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.
2. Security; guaranty; bail. [R.]
         The Parliament would yet give his majesty sufficient
         caution that the war should be prosecuted.
                                               --Clarendon.
3. Precept or warning against evil of any kind; exhortation
   to wariness; advice; injunction.
         In way of caution I must tell you.    --Shak.
{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.

\Cau"tion\ v. t. [imp. & p. p. {Cautioned}; p. pr. & vb.
n. {Cautioning}.]
To give notice of danger to; to warn; to exhort [one] to take
heed.
      You cautioned me against their charms.   --Swift.

\Cau"tion\, n. (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.