One who enters into, or offers themselves for, any service of their own free will, especially when done without pay.
The volunteers at the nature reserve meet up ever other Sunday to help its upkeep.
One who enters into military service voluntarily (but who, when in service, is subject to discipline and regulations like other soldiers), as opposed to a conscript.
A voluntary member of the organized militia of a country, as distinguished from a regular or member of the standing army.
That summer and fall the Army organized twenty-five regiments of volunteers, including two black regiments, which would have all-black captains and lieutenants. All officers were to be selected from regulars and volunteers who had distinguished themselves[…]
To enlist oneself as a volunteer.
To do or offer to do something voluntarily.
Borrowed from Middle French voluntaire, from Latin voluntārius (“willing, voluntary”); or from voluntary + -eer.
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to volunteer for doing the dishes
To offer, usually unprompted.
to volunteer an explanation