a person who voluntarily offers himself or herself for a service or undertaking.

a person who performs a service willingly and without pay.

Military . a person who enters the service voluntarily rather than through conscription or draft, esp. for special or temporary service rather than as a member of the regular or permanent army.

Law .

a person whose actions are not founded on any legal obligation so to act.

a person who intrudes into a matter that does not concern him or her, as a person who pays the debt of another where he or she is neither legally nor morally bound to do so and has no interest to protect in making the payment.

Agriculture . a volunteer plant.

( initial capital letter ) a native or inhabitant of Tennessee (used as a nickname).

of, pertaining to, or being a volunteer or volunteers

a volunteer fireman.

Agriculture . growing without being seeded, planted, or cultivated by a person; springing up spontaneously.

to offer oneself for some service or undertaking.

to enter service or enlist as a volunteer.

to offer (oneself or one's services) for some undertaking or purpose.

to give, bestow, or perform voluntarily

to volunteer a song.

to say, tell, or communicate voluntarily

to volunteer an explanation.

verb

compel , force , obligate

verb

advance , bring forward , chip in * , come forward , do on one’s own volition , enlist , go in * , let oneself in for , offer services , present , proffer , propose , put at one’s disposal , put forward , sign up , speak up , stand up , step forward , submit oneself , suggest , take bull by the horns , take initiative , take the plunge , take upon oneself , tender , extend , offer , unpaid , voluntary

noun

voluntary