The act of extinguishing or making extinct; a putting an end to; the act of putting out or destroying light, fire, life, activity, influence, etc
The termination of any lineage of organisms, from subspecies to species and higher taxonomic categories from genera to phyla Extinction can be local, in which one or more populations of a species or other unit vanish but others survive elsewhere, or total (global), in which all the populations vanish When biologists speak of the extinction of a particular species without further qualification, they mean total extinction1
is when a species of any animal, plant or creature is no longer found alive Back to Mammal main page
a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
Disappearance of a species from all or part of their geographic range Also see background extinction and mass extinction
a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus complete annihilation; "they think a meteor cause the extinction of the dinosaurs"
The procedure in a conditioning experiment where the unconditioned stimulus or the reinforcer is no longer presented (Anderson)