Volunteer

vol-un-tēr′, n. one who enters any service, esp. military, voluntarily or of his own free choice: a soldier belonging to any body other than the regular army.— adj. entering into service voluntarily.— v.t. to offer voluntarily.— v.i. to enter into any service of one's own free-will or without being asked. [Fr. volontaire —L. voluntarius .]