(countable) A memory of a neutral or positive experience associated with a stimulus which was created after a negative experience and conditioned response toward that stimulus.

plural of language extinction

plural of extinction event

Alternative form of age of extinction

The current period of Earth history characterised by large-scale extinction of lifeforms as a result of human activity.

plural of extinction level event

(chiefly science fiction) Synonym of mass extinction

Synonym of Permian extinction

(evolutionary theory, geology) A volcanic mass extinction at the end of the Permian period 251.9 million years ago.

(evolutionary theory, geology) One of five historical events in which the Earth experienced a loss of ∼75% of all species over a geological interval of less than 3 million years, the most recent being the Cretaceous–Paleogene extinction event 66 million years ago.