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metro

noun (UNDERGROUND RAILWAY)
 
 
/ˈmet.rəʊ/ US  /-roʊ/

Definition

[U] an underground electric railway system in some cities, especially in France: Let's go by Metro. a metro station the Paris metroRailways and railway lines
(Definition of metro noun (UNDERGROUND RAILWAY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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