Definitions from Wiktionary (Overground)

▸ adjective:  Above the ground.
▸ adjective:  Mainstream, not underground.
▸ noun:  (chiefly London) A commuter rail or similar rail transport system, or a train in such systems, generally running through an urban area largely above ground and faster than an underground or metro with fewer stops.
▸ noun:  (rail transport) The London Overground, a counterpart of London Underground operated by TfL (Transport for London), which operates some of the various lines around London which are mainly above ground.

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