== General definition == A metropolitan area combines an urban agglomeration (the contiguous, built-up area) with zones not necessarily urban in character, but closely bound to the center by employment or other commerce. These outlying zones are sometimes known as a commuter belt, and may extend well beyond the urban zone, to other political entit...
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http://en.wikipedia.org/wiki/Metropolitan_area
a major city together with its suburbs and nearby cities, towns, and environs over which the major city exercises a commanding economic and social ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/m/81
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