Synonym: defunctness, experimental extinction, extermination, extinguishing, quenching. Similar words: distinction, sanction, function, compunction, and function, functional, malfunction, dysfunction. Meaning: [-kʃn] 
n. 1. no longer in existence 2. no longer active; extinguished 3. the reduction of the intensity of radiation as a consequence of absorption and radiation 4. complete annihilation 5. a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus 6. the act of extinguishing; causing to stop burning.
n. 1. no longer in existence 2. no longer active; extinguished 3. the reduction of the intensity of radiation as a consequence of absorption and radiation 4. complete annihilation 5. a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus 6. the act of extinguishing; causing to stop burning. 
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61. Among the Scandinavian settlers of the Upper Mississippi Valley, leprosy had declined to near extinction.
62. The alligator, though pursued for its hide and much reduced in numbers, is not in present danger of extinction.
63. The Butterfly Conservation Society says the information could help save some of the rarest examples from extinction.
64. Only the egrets, spoonbill, and least tern, however, faced actual extinction before help arrived.
65. The original passenger pigeon was driven into extinction from a population that reached almost ten million at one point in time.
66. If it were as bad as its critics contend, our society would be teetering on the edge of extinction.
67. No market for furs equals no shops like that one, equals no fur trade, no species extinction.
68. If extinction is repeated, the behavior will eventually disappear or become extinct.
69. In their place were a strange land, a strange people, and the ever-present possibility of violence and extinction.
70. Appendix I of the convention lists species in danger of extinction.
71. Extinction might be expected to occur if your local pub stopped selling your favourite drink.
72. He waxed vehement about dinosaurs and extinction,(http://sentencedict.com/extinction.html) about continental drift and the good old Galapagos finch.
73. That beer swilling, tattooed, sexist monstrosity which is fast heading into extinction anyway.
74. The financial crises of the 1920s and the Great Depression of the 1930s had brought capitalism to the edge of extinction.
75. The brewers have at last woken up to the fact that their high-street shops have become dinosaurs slouching towards extinction.
76. He is at the forefront of the campaign to save the Elephant from extinction.
77. In the infrared, extinction by dust is an order of magnitude smaller than in the visible portion of the spectrum.
78. The character gaps between good species he explains by continued divergence and by the extinction of intermediate varieties.
79. How do species that colonize vents cheat the inevitable local extinction?
80. And the system faces global maritime extinction by February 1999.
81. Yet people ignore the plight of, say, the several species of bat which are on the edge of extinction.
82. In 1921, there was a huge increase in the emigration and physical extinction of households.
83. Athird disease, guinea worm, is on the brink of extinction.
84. Arms races sometimes culminate in extinction, and then a new arms race may begin back at square one.
85. There are between 80,000 and 100,000 species of trees, of which 8,000 are threatened with extinction.
86. The large numbers of wild orchids being traded threatens some species with extinction.
87. Indeed the most dramatic example of mass extinction known to biology has been caused by the introduction of an alien species.
88. They understand the dangers that lurk there, the balance between survival and extinction.
89. The passing bell is sounding for the mass extinction of species.
90. To an outsider, our raft would have appeared already to be on the verge of extinction.
More similar words: distinction, sanction, function, compunction, and function, functional, malfunction, dysfunction, distinctive, action, auction, section, fiction, reduction, election, fraction, reaction, infection, selection, objection, direction, prediction, collection, inspection, conviction, reflection, production, attraction, dictionary, connection.