Meaning of LIVING WILL in English

Document specifying medical measures to be taken or withheld in the event the writer is disabled.

Advances in medical technology now allow the body to be kept alive in circumstances that would normally result in death (e.g., inability to eat, breathe, or maintain the heartbeat), but many people do not want to be kept alive if there is no chance of recovery. Because it is impossible to express one's wishes when in a vegetative state, a living will allows them to be stated in advance. Such a document usually specifies conditions under which a do-not-resuscitate (DNR) order is to take effect and authorizes another person to make decisions on the patient's behalf.

Britannica English dictionary.      Английский словарь Британика.