| Noun | 1. | extinction - no longer in existence; "the extinction of a species"death - the absence of life or state of being dead; "he seemed more content in death than he had ever been in life" | |
| 2. | extinction - no longer active; extinguished; "the extinction of the volcano" | |
| 3. | extinction - the reduction of the intensity of radiation as a consequence of absorption and radiationabsorption - (physics) the process in which incident radiated energy is retained without reflection or transmission on passing through a medium; "the absorption of photons by atoms or molecules" scattering - the physical process in which particles are deflected haphazardly as a result of collisions | |
| 4. | extinction - complete annihilation; "they think a meteor cause the extinction of the dinosaurs" | |
| 5. | extinction - a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulusconditioning - a learning process in which an organism's behavior becomes dependent on the occurrence of a stimulus in its environment | |
| 6. | extinction - the act of extinguishing; causing to stop burning; "the extinction of the lights" | |