addition vs codicil

addition

noun
  • Anything that is added. 

  • The act of adding anything. 

  • The arithmetic operation of adding. 

  • A dot at the right side of a note as an indication that its sound is to be lengthened one half. 

  • A title annexed to a person's name to identify him or her more precisely. 

  • Something added to a coat of arms, as a mark of honour. 

codicil

noun
  • Any appendix or addition. 

  • An addition or supplement that explains, modifies, or revokes a will or part of one. 

  • An addition or supplement modifying any official document, such as a treaty. 

verb
  • To add a codicil to something. 

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