What does TRACK mean?

noun

1. a line or route along which something travels or moves“the hurricane demolished houses in its path”
2. evidence pointing to a possible solution“the police are following a promising lead”
3. a pair of parallel rails providing a runway for wheels
4. a course over which races are run
5. a distinct selection of music from a recording or a compact disc“he played the first cut on the cd”
6. an endless metal belt on which tracked vehicles move over the ground
7. (computer science) one of the circular magnetic paths on a magnetic disk that serve as a guide for writing and reading data
8. a groove on a phonograph recording