mediary vs substitutional

mediary

adj
  • Acting to cause or connect. 

  • occurring during the course of a disease. 

  • Having a primary hue (red, blue, or gold), as opposed to one that can be created by mixing colors with primary hues. 

  • Defining or inferring a generalization or category of meaning. 

  • Intermediate. 

noun
  • An intermediary or go-between; Something or someone that passes information, instructions, or influence between one person or thing and another person or thing. 

substitutional

adj
  • Of or pertaining to substitution or to a substitute 

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