/ ˌɔːtəˈmætɪk; NAmE / adjective , noun
( of a machine, device, etc. ) having controls that work without needing a person to operate them :
a fully automatic driverless train
automatic transmission (= in a car, etc.)
an automatic rifle (= one that continues to fire as long as the trigger is pressed)
done or happening without thinking
SYN instinctive :
Breathing is an automatic function of the body.
My reaction was automatic.
always happening as a result of a particular action or situation :
A fine for this offence is automatic.
► auto·mat·ic·al·ly / -kli; NAmE / adverb :
The heating switches off automatically.
I turned left automatically without thinking.
You will automatically get free dental treatment if you are under 18.
a gun that can fire bullets continuously as long as the trigger is pressed
( BrE ) a car with a system of gears that operates without direct action from the driver
—compare stick shift
mid 18th cent.: from Greek automatos acting of itself, from autos self. + -ic .