noun
- the state of being no longer used or practiced.
noun
- formal the condition of not being in use or practice; disusethose ceremonies had fallen into desuetude
1620s, from Middle French désuétude (16c.), from Latin desuetudo “disuse,” from desuetus, past participle of desuescere “become unaccustomed to,” from de- “away, from” (see de-) + suescere “become used to” (see mansuetude).