extinction n.
- no longer active; extinguished; "the extinction of the volcano"
- no longer in existence; "the extinction of a species" [syn: {defunctness}]
- the reduction of the intensity of radiation as a consequence of absorption and radiation
- complete annihilation; "they think a meteor cause the extinction of the dinosaurs" [syn: {extermination}]
- a learning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus [syn: {experimental extinction}]
- the act of extinguishing; causing to stop burning; "the extinction of the lights" [syn: {extinguishing}, {quenching}]