attorney-in-fact

Etymology
From and. Both words now rarely have those senses (outside of fixed expressions like this).

Noun

 * 1)  An agent of the person giving him/her the power of attorney (for a specific purpose or for general purposes) to act on his or her behalf. The attorney-in-fact’s power and responsibilities depend on the specific powers granted in the power of attorney document.

Translations

 * Dutch:
 * French:
 * German:
 * Italian:
 * Polish: ,
 * Portuguese:, representante legal
 * Spanish: ,