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, especially for special or temporary service rather than as a member of the regular or permanent army.
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.
verb (used without object)
to offer oneself for some service or undertaking.
to enter service or enlist as a volunteer.
verb (used with object)
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.

1590–1600; < French volontaire < Latin voluntārius voluntary, with -eer for French -aire

prevolunteer, noun, verb
unvolunteering, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To volunteered
World English Dictionary
volunteer (ˌvɒlənˈtɪə)
1.  a.  a person who performs or offers to perform voluntary service
 b.  (as modifier): a volunteer system; volunteer advice
2.  a person who freely undertakes military service, esp temporary or special service
3.  law
 a.  a person who does some act or enters into a transaction without being under any legal obligation to do so and without being promised any remuneration for his services
 b.  property law a person to whom property is transferred without his giving any valuable consideration in return, as a legatee under a will
4.  a.  a plant that grows from seed that has not been deliberately sown
 b.  (as modifier): a volunteer plant
5.  to offer (oneself or one's services) for an undertaking by choice and without request or obligation
6.  (tr) to perform, give, or communicate voluntarily: to volunteer help; to volunteer a speech
7.  (intr) to enlist voluntarily for military service
[C17: from French volontaire, from Latin voluntārius willing; see voluntary]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1600, "one who offers himself for military service," from M.Fr. voluntaire, noun use of adj. meaning "voluntary," from L. voluntarius "voluntary, of one's free will" (see voluntary). Non-military sense is first recorded 1638. The verb is first recorded 1755, from the
noun. Tennessee has been the Volunteer State since the Mexican War, when a call for 2,800 volunteers brought out 30,000 men.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
With a brush made from the pelt of a volunteered rat.
When the war came he volunteered, only to find that his delicate health would
  not allow him to share the hardships of a campaign.
Following the links provided seems to indicate that this research is based on
  volunteered web polls.
At the lecture he volunteered that the right to life movement was more
  important than the civil rights movement.
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