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Definition of autonomic nervous system noun from the Oxford Advanced American Dictionary

 

autonomic nervous system

 noun
noun
NAmE//ˌɔt̮ənɑmɪk ˈnərvəs ˌsɪstəm//
 
 
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the part of your nervous system that controls processes that are unconscious, for example the process of your heart beating
See the Oxford Advanced Learner's Dictionary entry: autonomic nervous system