volunteer

From Webster’s Revised Unabridged Dictionary (1913) [web1913]:

Volunteer \Vol`un*teer”\, n. [F. volontaire. See {Voluntary},
a.]
1. One who enters into, or offers for, any service of his own
free will.

2. (Mil.) One who enters into service voluntarily, but who,
when in service, is subject to discipline and regulations
like other soldiers; — opposed to conscript;
specifically, a voluntary member of the organized militia
of a country as distinguished from the standing army.

3. (Law) A grantee in a voluntary conveyance; one to whom a
conveyance is made without valuable consideration; a
party, other than a wife or child of the grantor, to whom,
or for whose benefit, a voluntary conveyance is made.
–Burrill.

From Webster’s Revised Unabridged Dictionary (1913) [web1913]:

Volunteer \Vol`un*teer”\, a.
Of or pertaining to a volunteer or volunteers; consisting of
volunteers; voluntary; as, volunteer companies; volunteer
advice.

From Webster’s Revised Unabridged Dictionary (1913) [web1913]:

Volunteer \Vol`un*teer”\, v. t. [imp. & p. p. {Volunteered}; p.
pr. & vb. n. {Volunteering}.]
To offer or bestow voluntarily, or without solicitation or
compulsion; as, to volunteer one’s services.

From Webster’s Revised Unabridged Dictionary (1913) [web1913]:

Volunteer \Vol`un*teer”\, v. i.
To enter into, or offer for, any service of one’s own free
will, without solicitation or compulsion; as, he volunteered
in that undertaking.

From WordNet (r) 1.7 [wn]:

volunteer
adj : without payment; “the soup kitchen was run primarily by
unpaid helpers”; “a volunteer fire department” [syn: {unpaid},
{volunteer(a)}]
n 1: a person who freely enlist for military service [syn: {military
volunteer}, {voluntary}] [ant: {draftee}]
2: a person who performs voluntary work [syn: {unpaid worker}]
v 1: tell voluntarily; “He volunteered the information”
2: agree freely; “She volunteered to drive the old lady home”;
“I offered to help with the dishes but the hostess would
not hear of it” [syn: {offer}]
3: do volunteer work