extinction

(noun) no longer active; extinguished. Example: "The extinction of the volcano."

(noun) no longer in existence. Synonyms: defunctness. Example: "The extinction of a species."

(noun) the reduction of the intensity of radiation as a consequence of absorption and radiation.

(noun) complete annihilation. Synonyms: extermination. Example: "They think a meteor cause the extinction of the dinosaurs."

(noun) a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus. Synonyms: experimental extinction.

(noun) the act of extinguishing; causing to stop burning. Synonyms: extinguishing, quenching. Example: "The extinction of the lights."