自主

independent / to act for oneself / autonomous

self / oneself / from / since / naturally / surely

owner / master / host / individual or party concerned / God / Lord / main / to indicate or signify / trump card (in card games)

can't help; involuntarily (idiom)

independent and autonomous (idiom); self-determination / to act independently / to maintain control over one's own affairs

ability to make one's own decisions

autonomic nervous system

autonomous system