appendix vs decrement

appendix

noun
  • A text added to the end of a book or an article, containing additional information. 

  • Any process, prolongation, or projection. 

  • The vermiform appendix. 

decrement

verb
  • To decrease a value by a basic quantity unit. 

noun
  • A small quantity removed or lost. One of a series of regular subtractions. 

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