voluntary
//ˈvɒləntri//
Adjective
1
Done, given, or acting of one's own free will without being forced or paid to do so
She does voluntary work at the local hospital on weekends.
2
Working, done, or maintained without payment
She does voluntary work at the local hospital on weekends.
3
Supported by voluntary contributions rather than by government funding
The organization is voluntary and relies entirely on donations from the public.
4
Under the conscious control of the brain; not automatic or involuntary
Breathing is usually automatic, but it can also be voluntary.
Noun
1
An organ solo played before, during, or after a church service
The organist played a beautiful voluntary before the wedding ceremony began.