extinction in WordNet English dictionary

1. no longer in existence
   "the extinction of a species"
   extinction  defunctness 
   
2. a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
   extinction  experimental extinction 
   
3. complete annihilation
   "they think a meteor cause the extinction of the dinosaurs"
   extinction  extermination 
   
4. the act of extinguishing; causing to stop burning
   "the extinction of the lights"
   extinction  extinguishing  quenching 
   
5. the reduction of the intensity of radiation as a consequence of absorption and radiation
   extinction 
   
6. no longer active; extinguished
   "the extinction of the volcano"
   extinction