expiration in WordNet English dictionary

1. the act of expelling air from the lungs
   exhalation  expiration  breathing out 
   
2. euphemistic expressions for death
   "thousands mourned his passing"
   passing  loss  departure  exit  expiration  going  release 
   
3. a coming to an end of a contract period
   "the expiry of his driver's license"
   termination  expiration  expiry