Unconstrained by the interference of another; unimpelled by the influence of another; not prompted or persuaded by another; done of his or its own accord; spontaneous; acting of one's self, or of itself; free.
Done by design or intention; intentional; purposed; intended; not accidental; as, if a man kills another by lopping a tree, it is not voluntary manslaughter.
Free; without compulsion; according to the will, consent, or agreement, of a party; without consideration; gratuitous; without valuable consideration.
One who engages in any affair of his own free will; a volunteer.
Free of coercion, duress, or undue inducement. In a clinical trial, refers to a participant's decision to enroll.
(military) a person who freely enlists for service
of your own free will or design; not forced or compelled; "man is a voluntary agent"; "participation was voluntary"; "voluntary manslaughter"; "voluntary generosity in times of disaster"; "voluntary social workers"; "a voluntary confession"
Chosen by one's own consent. Often refers to lack of minimum enrollment requirements.
for human subjects purposes, the act of freely consenting to being in a research study; free of coercion.
Free of coercion, duress, or undue inducement. Used in the research context to refer to a subject's decision to participate (or to continue to participate) in a research activity.