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WordReference Random House Unabridged Dictionary of American English © 2024ex•tinc•tion (ik stingk′shən),USA pronunciation n. - the act of extinguishing.
- Biologythe fact or condition of being extinguished or extinct.
- suppression;
abolition;
annihilation:the extinction of an army. - Biologythe act or process of becoming extinct;
a coming to an end or dying out:the extinction of a species. - Psychologythe reduction or loss of a conditioned response as a result of the absence or withdrawal of reinforcement.
- Astronomythe diminution in the intensity of starlight caused by absorption as it passes through the earth's atmosphere or through interstellar dust.
- Optics, Crystallography[Crystall., Optics.]the darkness that results from rotation of a thin section to an angle (extinc′tion an′gle)at which plane-polarized light is absorbed by the polarizer.
- Latin ex(s)tinctiōn- (stem of ex(s)tinctiō). See extinct, -ion
- late Middle English extinccio(u)n 1375–1425
Collins Concise English Dictionary © HarperCollins Publishers:: extinction /ɪkˈstɪŋkʃən/ n - the act of making extinct or the state of being extinct
- the act of extinguishing or the state of being extinguished
- complete destruction; annihilation
- reduction of the intensity of radiation as a result of absorption or scattering by matter
ex•tinct /ɪkˈstɪŋkt/USA pronunciation adj. - Biologyno longer in existence: an extinct species.
- no longer in use; obsolete: an extinct custom.
- no longer active: an extinct volcano.
ex•tinc•tion /ɪkˈstɪŋkʃən/USA pronunciation n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024ex•tinct (ik stingkt′),USA pronunciation adj. - Biologyno longer in existence;
that has ended or died out:an extinct species of fish. - no longer in use;
obsolete:an extinct custom. - extinguished;
quenched;
not burning. - having ceased eruption;
no longer active:an extinct volcano.
- Latin ex(s)tinctus put out, quenched, past participle of ex(s)tinguere to extinguish
- late Middle English 1400–50
- 1.See corresponding entry in Unabridged defunct, gone, vanished. See dead.
- 2.See corresponding entry in Unabridged archaic.
- 3.See corresponding entry in Unabridged out.
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