Vol″un‐ta‐ry, n.; pl.Voluntaries (�). 1. One who engages in any affair of his own free will; a volunteer. Shak.
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. (Eccl.) One who advocates voluntaryism.