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

  • noun An urban passenger transportation system using elevated or underground trains or a combination of both.

from The Century Dictionary.

  • See transit.

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

  • noun A commuter rail system that combines aspects of an interurban railway with those of a subway, using a menagerie of pathways such as viaduct, tunnel, beam, cut and cover, trench, at grade, and others.

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

  • noun an urban public transit system using underground or elevated trains


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