Definition of automatic adjective from the Oxford Advanced Learner's Dictionary

        

    automatic

     adjective
    adjective
    BrE BrE//ˌɔːtəˈmætɪk//
     
    ; NAmE NAmE//ˌɔːtəˈmætɪk//
     
     
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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. 2  done or happening without thinking synonym instinctive Breathing is an automatic function of the body. My reaction was automatic.
  3. 3  always happening as a result of a particular action or situation A fine for this offence is automatic.
  4. Word Origin mid 18th cent.: from Greek automatos ‘acting of itself’, from autos ‘self’. + -ic.Extra examples Promotion was almost automatic after two or three years. The machine is fully automatic. He appeared to have been killed with an automatic rifle. My camera has manual and automatic functions. The automatic doors opened as she approached. The line will operate with fully automatic driverless trains.
See the Oxford Advanced American Dictionary entry: automatic