Open English Wordnet
Nouns
(n)extinctionthe reduction of the intensity of radiation as a consequence of absorption and radiation
(n)extinction, exterminationcomplete annihilation“they think a meteor caused the extinction of the dinosaurs”
(n)extinction, experimental extinctiona conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
(n)extinction, extinguishing, quenchingthe act of extinguishing; causing to stop burning“the extinction of the lights”