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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
commuter railsystem that combines aspects of an interurban railwaywith those of a subway, using a menagerieof 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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