Definition of "extinction"

Thirteen long centuries have elapsed since the extinction of the last Zoroastrian Empire […]

1922, Maneckji Nusservanji Dhalla, Zoroastrian Civilization‎, page 41

The extinction of a species once so numerous seemed incredible.

1955, A. W. Schorger, The Passenger Pigeon: Its Natural History and Extinction, page vii

Dr. Manuel: You're wasting your time. The age of humanity is over. Our extinction is inevitable.

2008, BioWare, Mass Effect (Science Fiction), Redwood City: Electronic Arts, PC, scene: Eden Prime

Phoenix and Lubbock are both caught in severe drought, and it is going to get much worse. We may see many such [dust] storms in the decades ahead, along with species extinctions, radical disturbance of ecosystems, and intensified social conflict over land and water. Welcome to the Anthropocene, the epoch when humans have become a major geological and climatic force.

2012 January, Donald Worster, “A Drier and Hotter Future”, in American Scientist‎, volume 100, number 1, archived from the original on 26 January 2012, page 70

On the East and West Coast Main Lines in the 1950s/60s, for example, we saw the extinction of intermediate stations in order to create the same sort of accelerations that IRP is now promising. Back then, the priority was faster main line services, with wayside/intermediate stations paying the ultimate price.

2022 January 12, Nigel Harris, “Comment: Unhappy start to 2022”, in RAIL, number 948, page 3

In Perthshire, the Aberdeenshire catchments of Deeside and Donside, in Moray and Nairnshire to the north-east, the populations are in low single figures, putting them on the brink of local extinction.

2023 June 17, Severin Carrell, “Dancing Capercaillie bird makes a tentative comeback in Scotland”, in The Guardian‎