NON-USER

n. 1. A not using; failure to use; neglect of official duty; default of performing the duties and services required of an officer.
An office may be forfeited by misuser or nonuser.
2. Neglect or omission of use.
A franchise may be lost by misuser or non-user.

non-use

non-use |nɒnˈjuːs |(also non-usage ) ▶noun [ mass noun ] the refusal or failure to use something. DERIVATIVES non-user noun