auto

1. An automobile.

   My brother is an auto mechanic.

2. A setting for automatic operation.

   Put it on auto.

3. An automatic gearbox / transmission.

   A body coloured centre pillar signalled the arrival of an electronic four-speed auto, slight suspension revisions and minor trim changes.

4. A car with an automatic gearbox / transmission.

   It wasn't too bad but we did hire an auto (couldn't imagine changing gears with my right hand).

verb

To travel by automobile.

1. Capable of operating without external control or intervention.

   The automatic clothes washer was a great labor-saving device.

2. Done out of habit or without conscious thought.

   Absent-minded doodling is a form of automatic art.

3. Necessary, inevitable, prescribed by logic, law, etc.

   Spitting at another player means an automatic red card.

4. (of a firearm such as a machine gun) Firing continuously as long as the trigger is pressed until ammunition is exhausted.

   Fully automatic weapons cannot be legally owned by private citizens in the US, except in very special circumstances, as by private security companies.

5. (of a handgun) An autoloader; a semi-automatic or self-loading pistol, as opposed to a revolver or other manually actuated handgun, which fires one shot per pull of the trigger; distinct from machine guns.

   The US Army adopted John Browning's M1911 pistol as its sidearm, chambered in .45 ACP (Automatic Colt Pistol).

6. (of a local variable) Automatically added to and removed from the stack during the course of function calls.
7. (of a group) Having one or more finite-state automata

1. An autorickshaw.

   ... users are often unable to note down the number of the taxi or the auto as the driver will just zoom past.