v. To replace the traction-providing surface of a vehicle that employs tires, tracks or treads.n. A used tire whose surface, the tread, has been replaced to extend its life and use.n. a person who re-entered military service in World War Two after serving in World War One.v. to tread again, to walk along again, to follow a path again.n. A return over ground previously covered; a retraversal or repetition.