free will 
noun [mass noun]
The power of acting without the constraint of necessity or fate; the ability to act at one’s own discretion.This insight was the basis for Descartes's defense of free will and of the mind's ability to control the body....
- Compatibilist philosophies seek to reconcile free will and determinism in a modern time.
- The critics liked to quote the treatise as containing arguments for free will unrefuted even by their author.
Synonyms
volition, independence, self-determination, self-sufficiency, autonomy, spontaneity;
freedom, liberty
voluntarily, willingly, readily, freely, spontaneously, without reluctance, without being forced, without being asked, without being encouraged;
of one's own accord, of one's own volition, of one's own choosing, by one's own preference
adjective [attributive]
(Especially of a donation) voluntary: free-will offerings...
- Cost for the dinner is a free-will offering along with the donation of one canned food item.
- However, the intrepid duo persevered and the free-will gifts eventually got bagged.
- Moses, however, does not rely on free-will offerings.