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

 

metro

 adjective
adjective
BrE BrE//ˈmetrəʊ//
 
; NAmE NAmE//ˈmetroʊ//
 
 
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(North American English, informal) = metropolitan the New York metro areas 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