appertain vs dissociate

appertain

verb
  • To belong to or be a part of, whether by right, nature, appointment, or custom; to relate to. 

  • To belong as a part, right, possession, attribute, etc. 

dissociate

verb
  • To undergo dissociation. 

  • To part; to stop associating. 

  • To separate compounds into simpler component parts, usually by applying heat or through electrolysis. 

  • To make unrelated; to sever a connection; to separate. 

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