A voluntary organization is controlled and organized by the people who have chosen to work for it, often without being paid, rather than receiving help or money from the government.
1. (military) a person who freely enlists for service
2. composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a service or performance
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"