automatic
adjectiveUK /ˌɔː.təˈmæt.ɪk/
US /ˌɑː.t̬əˈmæt̬.ɪk/
Something automatic works by itself without a person doing it.
The automatic doors opened when we walked up to them.
OTHER MEANINGS
2. Done without thinking, like a habit.
She gave an automatic smile when she saw the camera.
3. Certain to happen in a usual way.
Winning the game was automatic for the best team.
4. A car that changes gears by itself.
My aunt drives a car with an automatic.