Volition is a noun.
Meanings: wish; choice; preference; will.
1. It is wrong to force one's career on one's children; they should be allowed to choose of their own volition.
2. Contributions at ISC are of a member's volition and it is not necessary that he/she should contribute on a daily basis.
3. The boss told his staff that they could join the weekly yoga training sessions of their own volition and that it was not compulsory.