mandate vs power of attorney

mandate

noun
  • An official or authoritative command; an order or injunction; a commission; a judicial precept; an authorization. 

  • An order by the League of Nations to a member nation to establish a government responsible for a conquered territory, as the colonies of Germany after World War I. 

  • A period during which a government is in power. 

  • Such a territory. 

  • The order or authority to do something, as granted to a politician by the electorate. 

verb
  • To authorize. 

  • To make mandatory. 

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 mandate and power of attorney occurred in a corpus of books? (source: Google Ngram Viewer )