OBSOLESCENCE
obsolescence
(noun) the process of becoming obsolete; falling into disuse or becoming out of date; “a policy of planned obsolescence”
Source: WordNet® 3.1
Etymology
Noun
obsolescence (countable and uncountable, plural obsolescences)
(uncountable) The state of being obsolete—no longer in use; gone into disuse; disused or neglected.
(countable) The process of becoming obsolete, outmoded or out of date.
Synonyms
• obsoleteness (much less common)
• obsoletion
Source: Wiktionary
Ob`so*les"cence, n. Etym: [See Obsolescent.]
Definition: The state of becoming obsolete.
Source: Webster’s Unabridged Dictionary 1913 Edition