Source : Webster's Revised Unabridged Dictionary (1913)

Escrow \Es"crow\, n. [OF. escroe, escroue, a roll of writings,
   bond. See {Scroll}.] (Law)
   A deed, bond, or other written engagement, delivered to a
   third person, to be held by him till some act is done or some
   condition is performed, and then to be by him delivered to
   the grantee. --Blackstone.

Source : WordNet®

escrow
     n : a written agreement (or property or money) delivered to a
         third party or put in trust by one party to a contract to
         be returned after fulfillment of some condition

Source : Free On-Line Dictionary of Computing

escrow
     
         An arrangement where something (generally money or
        documents) is held in trust ("in escrow") by a trusted third
        party until certain agreed conditions are met.  In computing
        the term is used for {key escrow} and also for {source code
        escrow}.
     
        (1999-12-14)