free will
1 ability to decide one´s own course of action 决定个人行动方针的能力; 自觉自愿
I did it of my own free will, ie acting voluntarily. 那是我自愿做的.
2 (belief in the) power to decide a course of action independently of God or fate 自由意志(不依靠上帝或命运而采取行动的决断力); 自由意志论.