voluntary

adjective | \ ˈvä-lən-ˌter-ē \ | vol·un·tary
  1. a : proceeding from one's own free choice or consent rather than as the result of duress, coercion, or deception a voluntary statement

    b : not compelled by law : done as a matter of choice or agreement voluntary arbitration

    c : made freely and with an understanding of the consequences a voluntary plea of guilty

  1. : done by design or intention

  1. : made without valuable consideration or for nominal consideration a voluntary conveyance