Etymology
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obsolescence (n.)

"state or process of gradually falling into disuse, a becoming obsolete," 1809; see obsolescent + -ence. Phrase planned obsolescence was coined 1932, revived as a disparaging term 1950s.

updated on July 26, 2019

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Definitions of obsolescence from WordNet

obsolescence (n.)
the process of becoming obsolete; falling into disuse or becoming out of date;
a policy of planned obsolescence
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.