Meaning of “automatic” - Learner’s Dictionary

automatic

adjective uk us /ˌɔːtəˈmætɪk/
MACHINE

B2 An automatic machine works by itself or with little human control:

automatic doors
CERTAIN

certain to happen as part of the normal process or system:

You get an automatic promotion after two years.
REACTION

done as a natural reaction without thinking:

My automatic response was to pull my hand away.
automatically adverb

(Definition of “automatic adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)