(of flora or fauna) in imminent danger of extinction; "an endangered species" An endangered language is a language that is at risk of falling out of use. If it loses all its [..]

A species whose continued existence is in jeopardy and is provided special protection by law. Source: USGS

A category on the IUCN Red List of Threatened Species which indicates a taxon is considered to be facing a very high risk of extinction in the wild. Adapted from International Union for Conservation o [..]

In libraries and archives, a category of item, or group of items, whose continued existence is threatened, usually by deterioration or the obsolescence of equipment required to read the format. Preser [..]

used for species that are in danger of extinction and whose survival is unlikely if the causal factors continue to exist. Included are species whose numbers have been reduced to a critical level or wh [..]

(adj) (of flora or fauna) in imminent danger of extinction

any species that is in danger of extinction

If an animal or plant is endangered then it is seriously at risk of becoming extinct.

Not Critically Endangered, but facing a very high risk of extinction in the wild in the near future (IUCN definition).

periclitatus

Animals or plants that survive in such low numbers that they could become extinct in a few years unless something is done to help the populations increase.

A species that is facing imminent extirpation or extinction.

IUCN Red List categories - a taxon is considered Endangered when it is not Critically endangered (q.v.) but is facing a very high risk of extinction in the wild in the near future (International Union [..]

Referring to a species (plant or animal) currently in danger of extinction.

A species with such a low population number, that the population is in danger of extinction.

a plant or animal species in danger of extinction and whose survival is unlikely if the adverse causal factors continue. The International Union for the Conservation of Nature (IUCN) defines an endangered species as one that “faces a very high risk of extinction in the near future”.

A term that applies to taxa (population, subspecies, species) in danger of extinction and for which survival is unlikely if the causal factors of loss continue.

 Defined under the ESA as "any species which is in danger of extinction throughout all or a significant portion of its range." » Endangered species

the species

Any species (or stock) that is likely to become extinct within the foreseeable future throughout all or a significant portion of its range.

A taxon is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered (see Section V), and it is therefore considered to be facing a very high risk o [..]

A species of animal that is in danger of dying out in the future unless steps are taken to preserve and protect it.

A species that according to the IUCN Red List is likely to become extinct.

In Canada, this specifically refers to indigenous species threatened with imminent extinction or extirpation over all or a significant portion of their Canadian range.