Plain English Meaning
An instrument that shows you which direction you are heading and, at the same time, points an arrow toward the radio station you have tuned in. Wherever the arrow points is the direction to that station from your aircraft.
Full Definition
A cockpit instrument that combines a rotating magnetic compass card with one or two bearing pointers driven by navigation receivers (typically ADF and/or VOR). The compass card automatically aligns with magnetic north, and the pointers continuously indicate the magnetic bearing from the aircraft to the tuned station.
Context Anchor
Seen in instrument flying when using panel instruments to maintain of direction and the location of a .