Source : Webster's Revised Unabridged Dictionary (1913)

Parole \Pa*role"\, n. [F. parole. See {Parley}, and cf.
   {Parol}.]
   1. A word; an oral utterance. [Obs.]

   2. Word of promise; word of honor; plighted faith; especially
      (Mil.), promise, upon one's faith and honor, to fulfill
      stated conditions, as not to bear arms against one's
      captors, to return to custody, or the like.

            This man had forfeited his military parole.
                                                  --Macaulay.

   3. (Mil.) A watchword given only to officers of guards; --
      distinguished from countersign, which is given to all
      guards.

   4. (Law) Oral declaration. See lst {Parol}, 2.

Parole \Pa*role"\, a.
   See 2d {Parol}.

Parole \Pa*role"\, v. t. [imp. & p. p. {Paroled}; p. pr. & vb.
   n. {Paroling}.] (Mil.)
   To set at liberty on parole; as, to parole prisoners.

Source : WordNet®

parole
     n 1: a promise; "he gave his word" [syn: {word}, {word of honor}]
     2: a secret word or phrase known only to a restricted group;
        "he forgot the password" [syn: {password}, {watchword}, {word},
         {countersign}]
     3: (law) a conditional release from imprisonment that entitiles
        the person to serve the remainder of the sentence outside
        the prison as long as the terms of release are complied
        with
     v : release a criminal from detention and place him on parole;
         "The prisoner was paroled after serving 10 years in
         prison"