Longman Dictionary of Contemporary English homepage

obsolescence

 noun
     
ob‧so‧les‧cence [uncountable]
1 when something becomes old-fashioned and no longer useful, because something newer and better has been invented
2

planned/built-in obsolescence

BBTI when a product is designed so that it will soon become unfashionable or impossible to use and will need replacing:
the planned obsolescence of some software
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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