<p><strong>Adjective</strong></p><ul><li>no longer in existence; having ended or died out: extinct pre-Colombian societies.</li><li>Biology, Ecology: (of a plant or animal species) having no living member remaining anywhere, not in the wild, in a naturalized population, nor in captivity, as categorized by the IUCN Red List: EX a list of extinct animals that once inhabited the Isle of Man.</li><li>Synonyms: gone, defunct</li><li>no longer in use; obsolete: an extinct custom.</li><li>Synonyms: archaic</li><li>extinguished; quenched; not burning: evidence of a half dozen extinct campfires.</li><li>Synonyms: out</li><li>Geology: (of a volcano) not having erupted for at least 10,000 years and not expected to erupt again.</li></ul>