(n.) The cessation of use; disuse; discontinuance of practice, custom, or fashion.

abandonment absentation abstention abstinence casting away cease cessation close closing closure conclusion discontinuance discontinuation disuse end ending evacuation forsaking jettison jettisoning leaving nonemployment nonprevalence nonuse obsolescence obsoleteness obsoletion obsoletism pensioning off pulling out retirement superannuation throwing overboard unprevalence withdrawal