no 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having ceased eruption; no longer active: an extinct volcano.

1400–50; late Middle English < Latin ex(s)tinctus put out, quenched, past participle of ex(s)tinguere to extinguish

nonextinct, adjective
unextinct, adjective

extinct, rare, scarce.

1. defunct, gone, vanished. See dead. 2. archaic. 3. out.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extinct (ɪkˈstɪŋkt)
1.  (of an animal or plant species) having no living representative; having died out
2.  quenched or extinguished
3.  (of a volcano) no longer liable to erupt; inactive
4.  void or obsolete: an extinct political office
[C15: from Latin exstinctus quenched, from exstinguere to extinguish]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

early 15c., from L. extinctus, pp. of extinguere (see extinguish). Originally of fires; the sense of the condition of "dying out" of a family or a hereditary title, 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
extinct   (ĭk-stĭngkt')  Pronunciation Key 
  1. Having no living members. Species become extinct for many reasons, including climate change, disease, destruction of habitat, local or worldwide natural disasters, and development into new species (speciation). The great majority of species that have ever lived—probably more than 99 percent—are now extinct.

  2. No longer active or burning, as an extinct volcano.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
In America, 53 languages have become extinct since 1950, more than in any other
For nearly two centuries, people have struggled to imagine what the great
  extinct dinosaurs looked like.
Fully prepared to overthrow everything on the planet in 1968, they were nearly
  all extinct by 1970.
The new work marks the first time that so much of the genetic material of an
  extinct creature has been retrieved.
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