extinction

英[ɪk'stɪŋ(k)ʃ(ə)n;ek-] 美[ɪk'stɪŋkʃən]

1. no longer in existence;

"the extinction of a species"

2. no longer active; extinguished;

"the extinction of the volcano"

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"

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

6. the act of extinguishing; causing to stop burning;

"the extinction of the lights"