voluntary voluntary /ˈvɑːləntɛri/

adjective

1. () Of your own free will or design; done by choice; not forced or compelled  ( voluntary )
   of your own free will or design; done by choice; not forced or compelled
    Man is a voluntary agent
   man is a voluntary agent
    Participation was voluntary
   participation was voluntary
    Voluntary manslaughter
   voluntary manslaughter
    Voluntary generosity in times of disaster
   voluntary generosity in times of disaster
    Voluntary social workers
   voluntary social workers
    A voluntary confession
   a voluntary confession
   
2. (physiology) controlled by individual volition  ( voluntary )
   (physiology) controlled by individual volition
    Voluntary motions
   voluntary motions
    Voluntary muscles
   voluntary muscles
   

noun

1. Composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a religious service or musical performance  ( voluntary )
   composition (often improvised) for a solo instrument (especially solo organ) and not a regular part of a religious service or musical performance
   
2. (military) a person who freely enlists for service  ( military volunteer , voluntary , volunteer )
   (military) a person who freely enlists for service
     The selfless volunteer dedicated their time and effort to helping those in need.
   The selfless volunteer dedicated their time and effort to helping those in need.