Definition of metro noun from the Oxford Advanced Learner's Dictionary

     

    metro

     noun
    noun
    BrE BrE//ˈmetrəʊ//
     
    ; NAmE NAmE//ˈmetroʊ//
     
    (pl. metros) Trains
     
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  1. 1(also the Metro) [singular] an underground train system, especially the one in Paris to travel on the metro/by metro the Paris Metro a metro station British/​Americanunderground / subway / metro / tube A city’s underground railway/​railroad system is usually called the underground (often the Underground) in British English and the subway in North American English. Speakers of British English also use subway for systems in American cities and metro for systems in other European countries. The Metro is the name for the systems in Paris and Washington, D.C. London’s system is often called the Tube. See related entries: Trains
  2. 2(Indian English) a large or capital city, especially Delhi, Kolkata, Mumbai or Chennai Here are the temperatures recorded at the four metros at 5 o'clock this morning.
  3. Word Origin early 20th cent.: from French métro, abbreviation of métropolitain (from Chemin de Fer Métropolitain ‘Metropolitan Railway’).
See the Oxford Advanced American Dictionary entry: metro