A document specifying the kind of medical care a person wants-or does not want-in the event of terminal illness or incapacity. Bloomberg Financial Dictionary
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living will UK US noun [C]
► LAW a written document in which a person expresses their wishes about what they want to happen if they become too ill to make decisions about their medical treatment or legal situation: draw up/make/prepare a living will »
She had drawn up a living will saying she did not want doctors to keep her alive if she were seriously ill.
Financial and business terms. 2012.