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1. One that occurs without volition or will. (

2. Done without conscious control. (Google Dictionary)

3. Without intention; unintentional. (

4. (esp. of muscles or nerves) Concerned in bodily processes that are not under the control of the will. (Google Dictionary)

5. Controlled by the autonomic nervous system; without conscious control. (

Word origin: From Late Latin involuntarius “involuntary,” from in– “not, opposite of”

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