n. & v.
--n.
1. a person who voluntarily undertakes a task or enters military or other service, esp. Mil. hist. a member of any of the corps of voluntary soldiers formerly organized in the UK and provided with instructors, arms, etc., by the State.
2 (usu. attrib.) a self-sown plant.
--v.
1. tr. (often foll. by to + infin.) undertake or offer (one's services, a remark or explanation, etc.) voluntarily.
2 intr. (often foll. by for) make a voluntary offer of one's services; be a volunteer.
Etymology: F volontaire (as VOLUNTARY), assim. to -EER