voluntary

voluntary definition - medical

vol·un·tar·y (vŏlˈən-tĕrˌē)

adjective
  1. Arising from or acting on one's own free will.
  2. Normally controlled by or subject to individual volition, as of respiration.
  3. Capable of making choices; having the faculty of will.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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