Definition of autonomic nervous system noun from the Oxford Advanced Learner's Dictionary

 

autonomic nervous system

 noun
noun
BrE BrE//ˌɔːtənɒmɪk ˈnɜːvəs sɪstəm//
 
; NAmE NAmE//ˌɔːtənɑːmɪk ˈnɜːrvəs sɪstəm//
 
 
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the part of your nervous system that controls processes which are unconscious, for example the process of your heart beating
See the Oxford Advanced American Dictionary entry: autonomic nervous system