Pronunciation: (in-vol'un-ter"ē), [key]
1. not voluntary; independent of one's will; not by one's own choice: an involuntary listener; involuntary servitude.
2. unintentional; unconscious: an involuntary gesture.
3. Physiol.acting independently of or done or occurring without volition: involuntary muscles.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.