Viability

Viability means in general "Capacity for survival" and is more specific used to mean:

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 born prematurely 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.
In the context of experimental biology, viability of cells and tissues refers to the extent to which those cells and tissues are living.
In the context of natural selection, the fraction of individuals that survives to a given age.

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