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From The Collaborative International Dictionary of English v.0.48:
Voluntary \Vol"un*ta*ry\, n.; pl. Voluntaries. 1. One who engages in any affair of his own free will; a volunteer. [R.] --Shak. [1913 Webster] 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. [1913 Webster] 3. (Eccl.) One who advocates voluntaryism. [1913 Webster]