definition of
extinction

[1] #1 extinction n. no longer active; extinguished; "the extinction of the volcano". wn

[2] #2 extinction n. [defunctness] no longer in existence; "the extinction of a species". wn

[3] #3 extinction n. the reduction of the intensity of radiation as a consequence of absorption and radiation. wn

[4] #4 extinction n. [extermination] complete annihilation; "they think a meteor cause the extinction of the dinosaurs". wn

[5] #5 extinction n. [experimental extinction] a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus. wn