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power of attorney
power of attorney: an instrument containing an authorization for one to act as the agent of the principal that terminates esp. upon revocation by the principal or death of the principal or agent – called also letter of attorney;
du·ra·ble power of attorney /'du̇r-ə-bəl-, 'dyu̇r-/: a power of attorney that becomes effective upon the principal's becoming incompetent or unable to manage his or her affairs and that is often used as a form of advance directive compare living will
general power of attorney: a power of attorney authorizing the agent to carry on business or an enterprise for the principal compare special power of attorney in this entry
irrevocable power of attorney: a power of attorney that cannot be revoked by the principal
special power of attorney: a power of attorney authorizing the agent to carry out a particular business transaction for the principal

Merriam-Webster’s Dictionary of Law. . 1996.