ex·tant

[ek-stuhnt, ik-stant]
adjective
1.
in existence; still existing; not destroyed or lost: There are only three extant copies of the document.
2.
Archaic. standing out; protruding.

Origin:
1535–45; < Latin ex(s)tant- (stem of ex(s)tāns) standing out, present participle of exstāre, equivalent to ex- ex-1 + stāre to stand

non·ex·tant, adjective

extant, extent.
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World English Dictionary
extant (ɛkˈstænt, ˈɛkstənt) [Click for IPA pronunciation guide]
 
adj
1.  still in existence; surviving
2.  archaic standing out; protruding
 
usage  Extant is sometimes wrongly used simply to say that something exists, without any connotation of survival: plutonium is perhaps the deadliest element in existence (not the deadliest element extant)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Extant is a GRE word you need to know.
So is immutable. Does it mean:
to criticize or reprimand severely.
unchangeable, changeless
Etymonline
Word Origin & History

extant
1545, "standing out above a surface," from L. extantem, prp. of extare "stand out, be visible, exist," from ex- "out" + stare "to stand," from PIE base *sta- "to stand" (see stet). Sense of "in existence" appeared in Eng. 1561.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The lack of extant monuments from these years is one reason for this elision.
However, modern science does allow us to draw some perfectly reasonable
  conclusions about our extant theories of the universe.
Of course, the extant of that relationship is not yet known.
The first, the acts of which are extant under his name in the editions of the
  councils, is certainly genuine.
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