Car

noun

1. A wheeled vehicle that moves independently, with at least three wheels, powered mechanically, steered by a driver and mostly for personal transportation.

   "She drove her car to the mall."

2. A wheeled vehicle, drawn by a horse or other animal; a chariot.
3. An unpowered unit in a railroad train.

   "The conductor coupled the cars to the locomotive."

4. An individual vehicle, powered or unpowered, in a multiple unit.

   "The 11:10 to London was operated by a 4-car diesel multiple unit."

5. A passenger-carrying unit in a subway or elevated train, whether powered or not.

   "From the frontmost car of the subway, he filmed the progress through the tunnel."