Dictionary

obsolescence

noun ob·so·les·cence \-ˈle-sən(t)s\

: the condition of no longer being used or useful : the condition of being obsolete

Full Definition of OBSOLESCENCE

:  the process of becoming obsolete or the condition of being nearly obsolete <the gradual obsolescence of machinery> <reduced to obsolescence>
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Examples of OBSOLESCENCE

  1. the obsolescence of the old technology
  2. Once a useful tool, slide rules have fallen into obsolescence.

First Known Use of OBSOLESCENCE

circa 1828

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