n A mark left by something that has passed along; as, the track, or wake, of a ship; the track of a meteor; the track of a sled or a wheel.
n (context|automotive) The distance between two opposite wheels on a same axletree (also track width)
n (music) A song or other relatively short piece of music, on a record, separated from others by a short silence
n Circular (never-ending) data storage unit on a side of magnetic or optical disk, divided into sector | sectors.