/ ˈmetrəʊ; NAmE ˈmetroʊ/ noun , adjective
■ noun ( pl. -os )
1.
(also the Metro ) [ sing. ] an underground train system, especially the one in Paris :
to travel on the metro / by metro
the Paris Metro
a metro station
➡ note at underground
2.
( IndE ) 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.
■ adjective
( NAmE , informal ) = metropolitan :
the New York metro areas
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WORD ORIGIN
early 20th cent.: from French métro , abbreviation of métropolitain (from Chemin de Fer Métropolitain Metropolitan Railway).