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An underground railway transit system typically serving metropolitan cities. A term more common in Europe, due to the prevalence of such railway systems there. The only place I could afford in Paris was nowhere near the metro, so it takes a long time to commute into work.
n. the police; the metropolitan police. (Not used in all metropolitan areas.) The metros took ten minutes to get to the scene of the crime, and the entire city is enraged.
See also: metro