disappearance in WordNet English dictionary

1. the act of leaving secretly or without explanation
   disappearance  disappearing 
   
2. gradually ceasing to be visible
   fade  disappearance 
   
3. the event of passing out of sight
   disappearance 
   
4. ceasing to exist
   "he regretted the disappearance of Greek from school curricula"; "what was responsible for the disappearance of the rainforest?"; "the disappearance of resistance at very low temperatures"
   disappearance