DESUETUDE
desuetude
(noun) a state of inactivity or disuse
Source: WordNet® 3.1
Etymology
Noun
desuetude (countable and uncountable, plural desuetudes)
Disuse, obsolescence (for example, the state of a custom that is no longer observed nor practised).
Source: Wiktionary
Des"ue*tude, n. Etym: [L. desuetudo, from desuescere, to grow out of
use, disuse; de + suescere to become used or accustomed: cf. F.
désuétude. See Custom.]
Definition: The cessation of use; disuse; discontinuance of practice,
custom, or fashion.
The desuetude abrogated the law, which, before, custom had
established. Jer. Taylor.
Source: Webster’s Unabridged Dictionary 1913 Edition