Definition of autonomic nervous system
: a part of the vertebrate nervous system that innervates smooth and cardiac muscle and glandular tissues and governs involuntary actions (such as secretion and peristalsis) and that consists of the sympathetic nervous system and the parasympathetic nervous system
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Merriam-Webster unabridged
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Time Traveler for autonomic nervous system
The first known use of autonomic nervous system was in 1898
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