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n 1: no longer active; extinguished; "the extinction of the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}]