free will
Primarily a philosophical term referring to the ability to make choices unconstrained by external forces. Used in academic, ethical, and religious contexts.
The problem of free will is an important theme in philosophy.
He made that decision of his own free will.
自由 means freedom or liberty in a broad sense, while 自由意志 specifically refers to the philosophical concept of free will.
意志 means will or volition in general, whereas 自由意志 is the compound term for free will.
doctrine of free will; libertarianism (in philosophy)
Compound of 自由 (freedom) and 意志 (will), likely a calque from Western philosophical terminology.