Definitions
1.nounOne who enters into, or offers for, any service of his/her own free will, especially when done without pay.
2.nounOne who enters into military 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.nounA person who acts out of his own will without a legal obligation, such as a donor.
4.nounA plant that grows spontaneously, without being cultivated on purpose; see volunteer plant in Wikipedia.
5.nounA native or resident of the American state of Tennessee.
6.verbTo enlist oneself as a volunteer.
7.verbTo do or offer to do something voluntarily."to volunteer for doing the dishes"
8.verbTo offer, usually unprompted."to volunteer an explanation"
9.verbTo grow without human sowing or intentional cultivation.
10.verbTo offer the services of (someone else) to do something."My sister volunteered me to do the dishes."