1828, from French viable "capable of life" (1530s), from vie "life" (from Latin vita "life," from PIE root *gwei- "to live") + -able. Originally of newborn infants; generalized sense is first recorded 1848. Related: Viably.
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Definitions of viability
(of living things) capable of normal growth and development;
capable of being done in a practical and useful way;