auto

1. An abbreviation of automobile.
   

1. of or pertaining to an automobile; as, an auto mechanic.
   

1. A combining form, with the meaning of self, one's self, one's own, itself, its own.
2. a prefix with the meaning of self-moving, self-propelling; as, an autocar, an autocarriage, an autotruck, etc., an automobile car, carriage, truck, etc.