ob·so·les·cence

[ob-suh-les-uhns]
noun
the state, process, or condition of being or becoming obsolete.

Origin:
1820–30; obsolesc(ent) + -ence

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
obsolescent (ˌɒbsəˈlɛsənt) [Click for IPA pronunciation guide]
 
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becoming obsolete or out of date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
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Obsolescence is always a great word to know.
So is callithumpian. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Etymonline
Word Origin & History

obsolescence
1828; see obsolescent.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
obsolescence [(ob-suh-les-uhns)]

A decline in the value of equipment or of a product brought about by an introduction of new technology or by changes in demand. (See planned obsolescence.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Collective consumption is also disrupting established business models based on
  built-in obsolescence.
Alas, this apparently gleaming economy had built-in obsolescence.
Also the presentation of old-time gangsterism in this light shows up its
  obsolescence.
It is entirely possible to innovate in the direction of increased
  specialization right into obsolescence and eventual destruction.
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