Definition of Voluntary

• (military) a person who freely enlists for service
• composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a religious service or musical performance
• 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"