extinction

noun

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 no longer active; extinguished"the extinction of the volcano"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