Voluntary
WordNet
adjective
(1) Of your own free will or design; not forced or compelled
"Man is a voluntary agent"
"Participation was voluntary"
"Voluntary manslaughter"
"Voluntary generosity in times of disaster"
"Voluntary social workers"
"A voluntary confession"
(2) Controlled by individual volition
"Voluntary motions"
"Voluntary muscles"
noun
(3) Composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a religious service or musical performance
(4) (military) a person who freely enlists for service
WiktionaryText
Etymology
From } < < < < , ppr. of .
Adjective
- Done, given, or acting of one's own free will.
- Working or done without payment.