from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The act of extinguishing.
- n. The condition of being extinguished.
- n. The fact of being extinct or the process of becoming extinct: "The most effective agent in the extinction of species is the pressure of other species” ( Alfred R. Wallace).
- n. Psychology A reduction or a loss in the strength or rate of a conditioned response when the unconditioned stimulus or reinforcement is withheld.
- n. Physiology A gradual decrease in the excitability of a nerve to a previously adequate stimulus, usually resulting in total loss of excitability.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The action of making or becoming extinct; annihilation.
- n. The absorption or scattering of electromagnetic radiation emitted by astronomical objects by intervening dust and gas before it reaches the observer.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
- n. State of being extinguished or of ceasing to be; destruction; suppression.
- n. The ceasing to exist of a species of living organism, such as a plant or animal, whose numbers declined to the point where the last member of the species died and therefore no new members of the species could ever again be born.
from The Century Dictionary and Cyclopedia
- n. The act of extinguishing, or the state of being extinguished; a quenching or putting out, as of fire or flame.
- n. Hence A bringing or coming to an end; a putting out of existence; suppression; destruction.
- n. In optics, the arresting of a beam of light by polarization, by the imperfect transparency of the medium, or otherwise.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the reduction of the intensity of radiation as a consequence of absorption and radiation
- n. no longer active; extinguished
- n. complete annihilation
- n. no longer in existence
- n. the act of extinguishing; causing to stop burning
- n. a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus
"The term extinction is generally used to describe new learning that the previously feared event is now safe," Phelps tells WebMD.
Voluntary human extinction is the humanitarian alternative to human disasters.
As compared to the neutral mutant, this probability of extinction is less by only 0.01.
Professor STUART PIMM (Duke University): Species extinction is rather like death and taxes.
The plight of the 16,928 species threatened with extinction is largely due to devastating man-made ecological changes such as habitat loss, pollution, climate change, and unsustainable exploitation.
If human extinction is what it takes to rid the universe of idiots such as Glenn Beck and Sean Hannity — Republicans in general along with their counterparts, the Mullahs of Iran, et al. — well, heck, I guess I can stand tall and accept the proposition.
Legislation championed by Resources Committee Chairman Richard Pombo (HR 3824) would effectively weaken the Endangered Species Act. We urge you to oppose HR 3824 on the moral grounds that extinction is not stewardship and that one of humanity's responsibilities is to care for all living things.
The carbon spike that triggered the last phase of the Permian extinction is pretty convincing.
Looking from Finland, either fishing faces certain extinction at the hands of EU envirocranks (Finland & Sweden only barely managed to block the Baltic fishing ban, Iceland and Norway stay out because the EU wants to kill fishing) or we * might* lose it due to overfishing.
If they die out, that is, if their number drop to zero, then they are not a biological success, but are extinct. angryoldfatman: So having sterile offspring is not an evolutionary disadvantage, unless it results in extinction, then it is.