Definitions

1. adjective

no longer existing or living; having become completely extinct.

“Many species of dinosaurs are now extinct.”

2. noun

a species, genus, or group of organisms that has become extinct.

“The extinct dodo bird was a rare sight in its habitat.”

3. verb

to make (a species or genus) become extinct; to eliminate completely.

“Human activities have led to the extinction of many natural habitats.”