The definition of desuetude is no longer being used.
An example of desuetude is the law concerning prohibition of alcohol which is no longer in use because it was repealed.
the condition of not being used or practiced any more; disuse: laws fallen into desuetude
Origin of desuetudeMiddle English ; from Classical Latin desuetudo ; from desuetus, past participle of desuescere, to disuse ; from de-, from + suescere, to be accustomed: see custom
A state of disuse or inactivity.
Origin of desuetudeFrench désuétude, from Latin dēsuētūdō, from dēsuētus, past participle of dēsuēscere, to put out of use : dē-, de- + suēscere, to become accustomed; see s(w)e- in Indo-European roots.
(countable and uncountable, plural desuetudes)