voluntary
Definitions
Done, given, or acting of one's own free will.
Working or done without payment; volunteer-based.
Controlled by the will rather than by reflex.
Examples
The organization relies heavily on voluntary contributions from the local community.
Participation in the after-school program is entirely voluntary for all students.
She decided to take a voluntary pay cut to help the company through its financial difficulties.
Synonyms
intentional optional discretionary spontaneous unforced willing freewill
Antonyms
compulsory mandatory obligatory forced involuntary required compelled