Definition of automatic adjective from the Oxford Advanced American Dictionary

        

    automatic

     adjective
    adjective
    NAmE//ˌɔt̮əˈmæt̮ɪk//
     
     
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  1. 1(of a machine, device, etc.) having controls that work without needing a person to operate them automatic doors 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)
  2. 2done or happening without thinking synonym instinctive Breathing is an automatic function of the body. My reaction was automatic.
  3. 3always happening as a result of a particular action or situation A fine for this offense is automatic.
  4.  automatically
     
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  5. NAmE//‑kli//
     
    adverb The heating switches off automatically. I turned left automatically without thinking. You will automatically get free dental treatment if you are under 18.
See the Oxford Advanced Learner's Dictionary entry: automatic