Dictionary definition for: Extinction
1. (n) no longer in existence; "the extinction of a species"
2. (n) no longer active; extinguished; "the extinction of the volcano"
3. (n) the reduction of the intensity of radiation as a consequence of absorption and radiation
4. (n) complete annihilation; "they think a meteor cause the extinction of the dinosaurs"
5. (n) a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
6. (n) the act of extinguishing; causing to stop burning; "the extinction of the lights"
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