Definition of: volunteer

(vol′ən·tir′) noun
1. One who enters into any service of his own free will.
2. One who voluntarily enters military service, but is then subject to the same regulations and discipline as other soldiers: opposed to conscript.
3. Law One who takes title under a deed made without valuable consideration; also, a voluntary agent or actor in a transaction.
—adjective
1. Pertaining to or composed of volunteers; voluntary.
2. Springing up naturally or spontaneously, as from fallen or self–sown seed: a volunteer growth.
—v.t. To offer to give or do.
—v.i. To enter or offer to enter into some service or undertaking of one's free will; enlist. [<obs. F voluntaire <OF, VOLUNTARY]