Definition of rover
1a person who spends their time wandering:they became rovers who departed further and further from civilization 2(in various sports) a player not restricted to a particular position on the field. 3a vehicle for driving over rough terrain, especially one driven by remote control over extraterrestrial terrain. 4 Croquet a ball that has passed all the wickets but not pegged out. a player who has a rover ball. 5 Archery a target for long-distance shooting. a target chosen at random and not at a determined range.