RhymeZone: voluntary definitions

Definitions of voluntary:

noun: composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a service or performance
noun: (military) a person who freely enlists for service
adjective: of your own free will or design; not forced or compelled
Example: "Man is a voluntary agent"
adjective: controlled by individual volition
Example: "Voluntary motions"

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