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extinction angle

 - 4 dictionary results

ex⋅tinc⋅tion

  [ik-stingk-shuhn]
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–noun
1. the act of extinguishing.
2. the fact or condition of being extinguished or extinct.
3. suppression; abolition; annihilation: the extinction of an army.
4. Biology. the act or process of becoming extinct; a coming to an end or dying out: the extinction of a species.
5. Psychology. the reduction or loss of a conditioned response as a result of the absence or withdrawal of reinforcement.
6. Astronomy. the diminution in the intensity of starlight caused by absorption as it passes through the earth's atmosphere or through interstellar dust.
7. Crystallography, Optics. the darkness that results from rotation of a thin section to an angle (extinction angle) at which plane-polarized light is absorbed by the polarizer.
Origin:
1375–1425; late ME extinccio(u)n < L ex(s)tinctiōn- (s. of ex(s)tinctiō). See extinct, -ion
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: ex·tinc·tion
Pronunciation: ik-'sti[ng](k)-sh&n
Function: noun
1 : the process of becoming extinct extinction of a species>; also : the condition or fact of being extinct
2 : the process of eliminating or reducing a conditioned response by notreinforcing it
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

extinction ex·tinc·tion (ĭk-stĭngk'shən)
n.
Progressive reduction in the strength of the conditioned response in successive conditioning trials during which only the conditioned stimulus is presented and the unconditioned stimulus is omitted. See absorbance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
extinction   (ĭk-stĭngk'shən)  Pronunciation Key 

  1. The fact of being extinct or the process of becoming extinct. See more at background extinction, mass extinction.

  2. A progressive decrease in the strength of a conditioned response, often resulting in its elimination, because of withdrawal of a specific stimulus.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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