immediacy vs mediacy

immediacy

noun
  • Immediate awareness or apprehension. 

  • Lack of mediation; directness. 

  • The quality of being immediate, of happening right away. 

mediacy

noun
  • Mediation; presence of an intermediary. 

  • The facility to work with words and numbers. 

  • The facility to work with media. 

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