extinction

noun

1. 1

   the act of extinguishing; causing to stop burning

   the extinction of the lights

2. 2

   a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus

3. 3

   complete annihilation

   they think a meteor cause the extinction of the dinosaurs

4. 4

   the reduction of the intensity of radiation as a consequence of absorption and radiation

5. 5

   no longer in existence

   the extinction of a species

6. 6

   no longer active; extinguished

   the extinction of the volcano