1. (

• extinction ,

) no longer active; extinguished; "the extinction of the volcano" ;

2. (

• extinction ,
• defunctness

) no longer in existence; "the extinction of a species" ;

3. (

• extinction

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

4. (

• extinction ,
• extermination

) complete annihilation; "they think a meteor cause the extinction of the dinosaurs" ;

5. (

• extinction ,
• experimental_extinction

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

6. (

• extinction ,
• extinguishing ,
• quenching

) the act of extinguishing; causing to stop burning; "the extinction of the lights" ;