magnetic levitation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The use of magnetic fields to suspend an object above another object without solid mechanical support. A well-known practical application is a high-speed train.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a method of supporting and transporting objects and vehicles by using a magnetic field to counterbalance the gravitational pull

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun high-speed rail technology; train is suspended on a magnetic cushion above a magnetized track and so travels free of friction