<p><strong>Noun</strong></p><ul><li>the act of extinguishing</li><li>the fact or condition of being extinguished or extinct</li><li>suppression; abolition; annihilation: the extinction of an army</li><li>Biology. the act or process of becoming extinct; a coming to an end or dying out: the extinction of a species</li><li>Psychology. the reduction or loss of a conditioned response as a result of the absence or withdrawal of reinforcement</li><li>Astronomy. the diminution in the intensity of starlight caused by absorption as it passes through the earth's atmosphere or through interstellar dust</li><li>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</li></ul><p><strong>Tweak</strong></p><ul><li>Word of the Day</li></ul>