voluntary
US /ˈvɑː.lən.ter.i/
UK /ˈvɑː.lən.ter.i/
1.
done, given, or undertaken of one's own free will.
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She made a voluntary donation to the charity.
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Participation in the program is entirely voluntary.
2.
(of an action) done by conscious decision; not automatic or instinctive.
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Breathing is usually automatic, but it can also be a voluntary action.
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He made a voluntary confession to the police.
1.
a person who works for an organization without being paid.
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Many voluntaries helped out at the local soup kitchen.
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She decided to become a voluntary at the animal shelter.