addition vs doubling

addition

noun
  • The arithmetic operation of adding. 

  • The act of adding anything. 

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

  • Anything that is added. 

  • 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. 

doubling

noun
  • The process or an instance of making something double; a multiplication by two. 

  • A pleat or fold. 

  • The act of turning around, or doubling back. 

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