extinctions

1. no longer active; extinguishedExamples: "the extinction of the volcano"Synonyms: extinction

2. no longer in existenceExamples: "the extinction of a species"Synonyms: defunctness, extinction

3. the reduction of the intensity of radiation as a consequence of absorption and radiationSynonyms: extinction

4. complete annihilationExamples: "they think a meteor cause the extinction of the dinosaurs"Synonyms: extermination, extinction

5. a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulusSynonyms: experimental extinction, extinction

6. the act of extinguishing; causing to stop burningExamples: "the extinction of the lights"Synonyms: extinction, extinguishing, quenching