n-ter-ee]
adjective, noun, plural -tar⋅ies.| 1. | done, made, brought about, undertaken, etc., of one's own accord or by free choice: a voluntary contribution. |
| 2. | of, pertaining to, or acting in accord with the will: voluntary cooperation. |
| 3. | of, pertaining to, or depending on voluntary action: voluntary hospitals. |
| 4. | Law.
|
| 5. | Physiology. subject to or controlled by the will. |
| 6. | having the power of willing or choosing: a voluntary agent. |
| 7. | proceeding from a natural impulse; spontaneous: voluntary laughter. |
| 8. | something done voluntarily. |
| 9. | a piece of music, frequently spontaneous and improvised, performed as a prelude to a larger work, esp. a piece of organ music performed before, during, or after an office of the church. |

voluntary vol·un·tar·y (vŏl'ən-těr'ē)
adj.
Arising from or acting on one's own free will.
Normally controlled by or subject to individual volition, as of respiration.
Capable of making choices; having the faculty of will.