ob‧so‧les‧cence /ˌɒbsəˈlesəns $ ˌɑːb-/ noun [uncountable]

1. when something becomes old-fashioned and no longer useful, because something newer and better has been invented

2. planned/built-in obsolescence 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

[TahlilGaran] Dictionary of Contemporary English ▲