obsolescent

[ob-suh-les-uhnt]
adjective
1.
becoming obsolete; passing out of use, as a word: an obsolescent term.
2.
becoming outdated or outmoded, as machinery or weapons.
3.
Biology. gradually disappearing or imperfectly developed, as vestigial organs.

Origin:
1745–55; < Latin obsolēscent- (stem of obsolēscēns, present participle of obsolēscere to fall into disuse). See obsolete, -escent

obsolescently, adverb

1. archaic, obsolescent, obsolete ; 2. obsolescent, obsolete.
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World English Dictionary
obsolescent (ˌɒbsəˈlɛsənt)
 
adj
becoming obsolete or out of date
 
[C18: from Latin obsolescere; see obsolete]
 
obso'lescence
 
n
 
obso'lescently
 
adv

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

obsolescent
1755, from L. obsolescentum (nom. obsolescens), prp. of obsolescere "fall into disuse" (see obsolete).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Indeed, it could be obsolescent only a few years after it enters service.
The light bulb producing companies would go out of business if they did not
  build their products to become obsolescent.
Many public facilities are aging or obsolescent and have suffered from deferred
  maintenance.
Only those obsolescent and un-maintained buildings suffered structural damage
  and only in isolated instances.
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