voluntary

[ˈvɒləntərɪ,-trɪ]
adj
performed, undertaken, or brought about by free choice, willingly, or without being asked
a voluntary donation
(of persons) serving or acting in a specified function of one's own accord and without compulsion or promise of remuneration
a voluntary social worker
done by, composed of, or functioning with the aid of volunteers
a voluntary association
endowed with, exercising, or having the faculty of willing
a voluntary agent
arising from natural impulse; spontaneous
voluntary laughter
acting or done without legal obligation, compulsion, or persuasion.made without payment or recompense in any form
(of the muscles of the limbs, neck, etc) having their action controlled by the will
maintained or provided by the voluntary actions or contributions of individuals and not by the state
the voluntary system
n
a composition or improvisation, usually for organ, played at the beginning or end of a church service
work done without compulsion
a volunteer, esp in an army