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subway system is a noun meaning "an electric railway operating below the surface of the ground (usually in a city)". It carries one recorded sense.
an electric railway operating below the surface of the ground (usually in a city)
“in Paris the subway system is called the `metro' and in London it is called the `tube' or the `underground'”
Definitions, synonyms and semantic relations for subway system come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.