explanation vs explication

explanation

noun
  • The act or process of explaining. 

  • Something that explains, makes understandable. 

  • A resolution of disputed points pursuant to discussion; a mutual clarification of disputed points; reconciliation. 

explication

noun
  • The act of explaining; an explanation. 

  • The sense given by an expositor. 

  • The act of opening or unfolding. 

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