adjective Capable of operating without external control or intervention.
The automatic clothes washer was a great labor-saving device.
adjective Done out of habit or without conscious thought.
The reaction was automatic: flight!
adjective Necessary, inevitable, prescribed by logic, law, etc.
Spitting at another player means an automatic red card.
adjective 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.
adjective 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).
adjective Automatically added to and removed from the stack during the course of function calls.
adjective Having one or more finite-state automata.
noun A car with an automatic transmission; the transmission itself.
I never learned to drive a stick. I can only drive an automatic.