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obsolescence

/ˌɑb.səˈlɛs.əns/ noun C2
  1. The state of being obsolete—no longer in use; gone into disuse; disused or neglected. (uncountable)
  2. The process of becoming obsolete, outmoded or out of date. (countable)

Plural obsolescences

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From the library

The book meticulously chronicles his exacting training while simultaneously lamenting the inevitable obsolescence of his beloved profession.
The Pilot and the Pen, p. 1 · C2
Without the vital economic lifeblood of passing tourists, previously vibrant main streets languished and ultimately succumbed to a quiet commercial obsolescence.
The Asphalt Arteries: How the Interstates Reshaped America, p. 1 · C2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.