Definitions

1. noun

a system of rapid transit in a city, typically consisting of underground or elevated trains, often with a network of lines and stations.

“I took the metro to work this morning.”

2. noun

a city or urban area served by such a system.

“The metro area has a population of over 5 million people.”

3. noun

short for metropolitan, relating to or characteristic of a city or urban area.

“metro politics refer to the politics of urban areas.”

4. verb

to provide (a city or urban area) with a rapid transit system.

“The city is planning to metro its public transportation system.”