The Collaborative International Dictionary of English v.0.48:

Kidnap \Kid"nap`\ (k[i^]d"n[a^]p`), v. t. [imp. & p. p.
   Kidnaped (k[i^]d"n[a^]pt`) or Kidnapped; p. pr. & vb. n.
   Kidnaping or Kidnapping.] [Kid a child + Prov. E. nap to
   seize, to grasp. Cf. Knab, Knap, Nab.]
   To take (any one) by force or fear, and against one's will,
   with intent to carry to another place. --Abbott.
   [1913 Webster]

         You may reason or expostulate with the parents, but
         never attempt to kidnap their children, and to make
         proselytes of them.                      --Whately.
   [1913 Webster]

   Note: Originally used only of stealing children, but now
         extended in application to any human being,
         involuntarily abducted. Kidnaper

The Collaborative International Dictionary of English v.0.48:

kidnapping \kidnapping\ n.
   the unlawful act of capturing and carrying away a person
   against their will and holding them in false imprisonment.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

kidnapping
    n 1: (law) the unlawful act of capturing and carrying away a
         person against their will and holding them in false
         imprisonment [syn: kidnapping, snatch]