Extinct
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In a general sense, the term "extinct" means no longer active or living. It is sometimes applied to kinds of organisms, to cultures, to religions, to geological processes (e.g. "extinct volcano"), to social movements, and, essentially, to any other object or process to which the concept of life or activity is applicable.
In the specific biological/paleontological sense, "extinct" refers to the loss of all living representatives of a taxon (that is, of all the members of a species, a genus, a phylum, etc.).