Done, given, or acting of one's own free will. / Done by design or intention; intentional. / Working or done without payment. / Endowed with the power of willing. / Of or relating to voluntarism.

(obsolete) Voluntarily.

(music) A short piece of music, often having improvisation, played on a solo instrument. / A volunteer. / A supporter of voluntarism; a voluntarist.

The condition of being voluntary.

plural of voluntary

plural of voluntariness

(dated) A period of voluntary military service

(anatomy) Muscle that is normally controlled by individual volition; skeletal muscle.

Work done voluntarily.

(property law) Any structural change made to an estate in land that intentionally or negligently causes harm to the estate or depletes its resources, unless this depletion is a continuation of a pre-existing use.