voluntary

/ˈvɑlənˌtɛri/
adjective
  1. Done, given, or acting of one's own free will; not forced or required.
    • He performed voluntary community service to help the homeless.
    • She made a voluntary donation to the charity.
    • Participation in the after-school program is completely voluntary.
  2. Relating to or controlled by the will; involving conscious choice or intention.
    • Blinking can be both voluntary and involuntary.
    • Voluntary muscles are those you can move on purpose, like your arms and legs.
    • The decision to speak was a voluntary action.
noun
  1. A piece of music played, often in a church, as an introduction or interlude, typically improvised or chosen freely.
    • The organist played a beautiful voluntary before the service began.
    • During the quiet moment, a soft voluntary filled the cathedral.
    • The choir waited while the pianist finished the voluntary.
What does "voluntary" mean? | whatsthatwordmean | whatsthatwordmean