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extinction [extinctions]▼(the action of making or becoming extinct)noun[UK: ɪk.ˈstɪŋk.ʃn̩] [US: ɪk.ˈstɪŋk.ʃn̩]
retrogression▼(decline)noun[UK: ˌre.trə.ˈɡreʃ.n̩] [US: ˌre.trə.ˈɡreʃ.n̩]
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