annex vs compression

annex

verb
  • To attach or connect, as a consequence, condition, etc. 

  • To join; to be united. 

  • To add something to another thing, especially territory; to incorporate. 

noun
  • An appendix to a book or document. 

  • An addition to the territory of a country or state, from a neighbouring country or state, normally by military force. 

  • An addition, an extension. 

  • An addition or extension to a building. 

compression

noun
  • The cycle of an internal combustion engine during which the fuel and air mixture is compressed. 

  • An increase in density; the act of compressing, or the state of being compressed; compaction. 

  • The electronic process by which any sound's gain is automatically controlled. 

  • The deviation of a heavenly body from a spherical form. 

  • The process by which data is compressed. 

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