expiration vs terminus

expiration

noun
  • A cessation, extinction, ending 

  • That which is produced by breathing out, as a sound. 

  • Emission of volatile matter; exhalation. 

  • The last emission of breath; death. 

  • The act of expiring. 

  • The act or process of breathing out, or forcing air from the lungs through the nose or mouth 

terminus

noun
  • The end or final point of something. 

  • A boundary or border, or a post or stone marking such a boundary. 

  • The end point of a transportation system, or the town or city in which it is located. 

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