[des-wi-tood, -tyood]
the state of being no longer used or practiced.

1425–75; late Middle English < Latin dēsuētūdo, equivalent to dēsuē-, base of dēsuēscere to become disaccustomed to, unlearn (dē- de- + suēscere to become accustomed to) + -tūdō -tude Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
desuetude (dɪˈsjuːɪˌtjuːd, ˈdɛswɪtjuːd)
formal the condition of not being in use or practice; disuse: those ceremonies had fallen into desuetude
[C15: from Latin dēsuētūdō, from dēsuescere to lay aside a habit, from de- + suescere to grow accustomed]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1623, from M.Fr. desuetude, from L. desuetudo (gen. desuetudinis) "disuse," from desuetus, pp. of desuescere "become unaccustomed to," from de- "away, from" + suescere "become used to" (see mansuetude).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
After an existence of nearly twenty years of almost innocuous desuetude these laws are brought forth.
Not only is the language actually growing, but old words take on new senses, while others drift into desuetude.
For her, ripping off a hated agency could serve the ultimate cause of driving it into disrepute or desuetude.
In the churches, of course, the proper observances of the day will not be permitted to lapse into desuetude.
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