9 Grammatical Pitfalls


[ob-suh-les-uh nt] /ˌɒb səˈlɛs ənt/
becoming obsolete; passing out of use, as a word:
an obsolescent term.
becoming outdated or outmoded, as machinery or weapons.
Biology. gradually disappearing or imperfectly developed, as vestigial organs.
Origin of obsolescent
1745-55; < Latin obsolēscent- (stem of obsolēscēns, present participle of obsolēscere to fall into disuse). See obsolete, -escent
Related forms
obsolescently, adverb
Can be confused
archaic, obsolescent, obsolete.
obsolescent, obsolete. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for obsolescent
  • 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.
  • In the first place, the old station was obsolescent, and maintenance was a serious problem.
  • Moreover, shifting regulatory schemes unavoidably leave obsolescent regulations in their wake.
  • Investment is directed to the new growth areas while sections of central cities grow older and more obsolescent.
  • No new ingot casting facilities are projected to be built because it is an obsolescent technology.
British Dictionary definitions for obsolescent


becoming obsolete or out of date
Derived Forms
obsolescence, noun
obsolescently, adverb
Word Origin
C18: from Latin obsolescere; see obsolete
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for obsolescent

1755, from Latin obsolescentum (nominative obsolescens), present participle of obsolescere "fall into disuse" (see obsolete).

Online Etymology Dictionary, © 2010 Douglas Harper
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