necessitation vs prescription

necessitation

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

prescription

noun
  • Synonym of enactment, the act of establishing a law, regulation, etc., particularly in writing; an instance of this. 

  • A written order from an authorized medical practitioner for provision of a medicine or other treatment, such as (ophthalmology) the specific lenses needed for a pair of glasses. 

  • An established time period after which a person who has uninterruptedly, peacefully, and publicly used another's property acquires full ownership of it. 

  • An established time period within which a right must be exercised and after which it is null and permanently unenforceable. 

  • The act of establishing or formalizing ideal norms for language use, as opposed to describing the actual norms of such use; an instance of this. 

  • Any plan of treatment or planned treatment. 

  • The medicine or treatment provided by such an order. 

adj
  • only available with a physician or nurse practitioner's written prescription 

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