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From The Collaborative International Dictionary of English v.0.48:
Viability \Vi`a*bil"i*ty\, n. The quality or state of being viable. Specifically: [1913 Webster] (a) (Law) The capacity of living after birth. --Bouvier. [1913 Webster] (b) The capacity of living, or being distributed, over wide geographical limits; as, the viability of a species. [1913 Webster]