(1) The act of extinguishing; causing to stop burning
"The extinction of the lights"
(2) A conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
(3) Complete annihilation
"They think a meteor cause the extinction of the dinosaurs"
(4) The reduction of the intensity of radiation as a consequence of absorption and radiation
(5) No longer in existence
"The extinction of a species"
(6) No longer active; extinguished
"The extinction of the volcano"
< < < , pp. ; see extinguish.