The Collaborative International Dictionary of English v.0.48:

magnetic levitation \magnetic levitation\ n.
   The process of supporting an object, such as a vehicle, with
   a magnetic field so that it does not contact the object
   supporting it; it is a method used for eliminating friction
   in moving vehicles, and is used, e.g. in high-speed rail
   technology where a train is suspended on a magnetic cushion
   above a magnetized track and so travels free of friction.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

magnetic levitation
    n 1: high-speed rail technology; train is suspended on a
         magnetic cushion above a magnetized track and so travels
         free of friction [syn: magnetic levitation, maglev]