Definify.com

Webster 1913 Edition

Noun.

Gradual cessation of use or custom; neglect of use; disuse.

[R.]

Hooker.

Noun.

Disyuzage. [dis and usage.] Gradual cessation of use or custom; neglect of use, exercise or practice. We lose words by disusage.

disusage ‎(uncountable)

Gradual cessation of use or custom; disuse.
(Can we find and add a quotation of Hooker to this entry?)