Tenure in office: entitlement to remain until completion unless lawfully curtailed, absent justifiable grounds preventing continuation. Tenure in office denotes the period during which an office is held and, once appointed to a tenure post, an incumbent is entitled to continue in that post until the expiry of the tenure unless the tenure is lawfully curtailed for justifiable reasons. The concept excludes departure by superannuation where the office is a fixed-term appointment, and the tenure normally ends by efflux of time on completion of the fixed period.