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Extinction is observed in both operantly conditioned and classically conditioned behavior. When operant behavior that has been previously reinforced no longer produces reinforcing consequences the behavior gradually stops occurring.
By Richard Nordquist. Definition. A linguistic term for the end or extinction of a language. Also called language extinction. Distinctions are commonly drawn between an endangered language (one with few or no children learning the language) and an extinct language (one in which the last native speaker has died). See Examples and Observations below.