auto.
adjective
Definitions
Capable of operating without external control or intervention.
Example: The automatic clothes washer was a great labor-saving device.
Done out of habit or without conscious thought.
Example: Absent-minded doodling is a form of automatic art.
Necessary, inevitable, prescribed by logic, law, etc.
Example: Spitting at another player means an automatic red card.
(of a firearm such as a machine gun) Firing continuously as long as the trigger is pressed until ammunition is exhausted.
Example: Fully automatic weapons cannot be legally owned by private citizens in the US, except in very special circumstances, as by private security companies.