Of persons: that is such of one's own accord or free choice; acting voluntarily, willingly, or spontaneously in a specified capacity; also, endowed…

Exercising or capable of exercising the will, volitional. Also: conveying the impulses of the will.

Possessed of, endowed with, the faculty of volition; exercising or capable of exercising this.

Having the ability to act or accomplish at will; voluntary.