extinction [extinctions](the action of making or becoming extinct) noun [UK: ɪk.ˈstɪŋk.ʃn̩] [US: ɪk.ˈstɪŋk.ʃn̩]They are in danger of extinction. = Están en peligro de extinción.
extinción masiva noun {f}
mass extinction(sharp decrease in the total number of species) noun