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English definition of “obsolescence”

obsolescence

noun [U] uk   /ˌɒb.səˈles.əns/ us    /ˌɑːb-/
the quality of being obsolete: Mobile phone technology is developing so quickly that many customers are concerned about obsolescence. built-in/planned obsolescence the fact that a product is intentionally designed and made so that it will not last for a long time
(Definition of obsolescence from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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