attorney-in-fact vs power of attorney

attorney-in-fact

noun
  • 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. 

power of attorney

noun
  • The legal authorisation of one person to act as the agent of another. 

  • A legal document allowing one person to act as the agent of another. 

How often have the words attorney-in-fact and power of attorney occurred in a corpus of books? (source: Google Ngram Viewer )