(neuroanatomy) In humans and other vertebrates, the part of the nervous system that regulates the involuntary activity of the heart, intestines and glands. These activities include digestion, respiration, perspiration, metabolism, and the modulation of blood pressure.

plural of autonomic nervous system

(historical) an autonomous republic of the Soviet Union within the Georgian SSR

(historical) an autonomous okrug of the Soviet Union within Irkutsk Oblast; now part of Ust-Orda Buryat Okrug

an autonomous region located in the southern Philippines.