Occurring no more. The word is usually used for species but can apply to any level of classification. Recent extinctions are hard to prove, and an ‘official' limit of 50 years with no recorded sightings of the species is now used.
extinction: the disappearance of a type or groups of organism from the Earth. Mass extinctions are the disappearance of large numbers of species in one event, and are believed to be the result of catastrophic events which cause a break-down in the ecosystem.
adj: A species that is no longer living on earth. All representatives of the species are dead. All the species that once occupied the earth but are no longer living are extinct. We know of their existence through studying the fossil record . Compare to extant .
Extinct was a British television series that featured eight celebrities highlighting the plight of some of the world's most endangered species. It was presented by ZoÃ« Ball and Sir Trevor McDonald. The public were asked to phone in and vote for which animal they wanted to receive Â£250,000 in order to help save it from extinction.