authority vs magister

authority

noun
  • Status as a trustworthy source of information, reputation for mastery or expertise; or claim to such status or reputation. 

  • A reliable, definitive source of information on a subject. 

  • Persons, regarded collectively, who occupy official positions of power; police or law enforcement. 

  • Official permission; authorisation to act in some capacity on behalf of a ruling entity. 

  • A government-owned agency that runs a revenue-generating activity for public benefit. 

  • Power or right to make or enforce rules or give orders; or a position having such power or right. 

magister

noun
  • The possessor of a master's degree. 

  • Master; sir: a title used in the Middle Ages, given to a person in authority, or to one having a licence from a university to teach philosophy and the liberal arts. 

How often have the words authority and magister occurred in a corpus of books? (source: Google Ngram Viewer )