In the context of Pregnancy , viability refers to either:
--- an early stage pregnancy that has a chance of reaching full-term and a live birth (as opposed to, for example, an Ectopic Pregnancy ); or
--- the shortest length of pregnancy after which a child BornPrematurely has a chance of survival.
In an environmental conservation context, viability indicates the ability of a Conservation Target to persist for many generations or over long time periods.
