VOLUNTARY (2)
Source: 566, 567
voluntary (2). Voluntary, n. music played at will, a volunteer
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Vol″un‐ta‐ry, n.; pl. Voluntaries (�). 1. 1. One who engages in any affair of his own free will; a volunteer. Shak.
2. 2. (Mus.) A piece played by a musician, often extemporarily, according to his fancy; specifically, an organ solo played before, during, or after divine service.
3. 3. (Eccl.) One who advocates voluntaryism.