GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Subway (?), n.
   1. An underground way or gallery; especially, a passage under a street, in which water mains, gas mains, telegraph wires, etc., are conducted.
   
   [1913 Webster]
   
   
   2. An underground railroad, usually having trains powered by electricity provided by an electric line running through the underground tunnel.  It is usually confined to the center portion of cities; -- called also tube, and in Britain, underground.  In certain other countries (as in France or Russia) it is called the metro.
   
   [PJC]