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Extinction
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 extinction n.
  1. no longer active; extinguished; "the extinction of the volcano"
  2. no longer in existence; "the extinction of a species" [syn: {defunctness}]
  3. the reduction of the intensity of radiation as a consequence of absorption and radiation
  4. complete annihilation; "they think a meteor cause the extinction of the dinosaurs" [syn: {extermination}]
  5. a learning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus [syn: {experimental extinction}]
  6. the act of extinguishing; causing to stop burning; "the extinction of the lights" [syn: {extinguishing}, {quenching}]
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