authority vs necessitation

authority

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

  • 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. 

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

necessitation

noun
  • Necessity, understood as a logical or other philosophical principle, or as a law or force of nature. 

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