1 : proceeding from the will or from one's own choice or consent
2 : unconstrained by interference : SELF-DETERMINING
3 : done by design or intention : INTENTIONAL (voluntary manslaughter)
4 : of, relating to, subject to, or regulated by the will (voluntary behavior)
5 : having power of free choice
6 : provided or supported by voluntary action (a voluntary organization)
7 : acting or done of one's own free will without valuable consideration or legal obligation
Cattle might get individual ID numbers
U.S. livestock might soon receive individual identification numbers in a voluntary plan to prevent the spread of mad cow and other diseases.
NAIS Plan from USDA