From The Collaborative International Dictionary of English v.0.48:

Viable \Vi"a*ble\, a. [F., from vie life, L. vita. See Vital.]
   Capable of living; born alive and with such form and
   development of organs as to be capable of living; -- said of
   a newborn, or a prematurely born, infant.
   [1913 Webster]

         VIABLE, Vitae habilis, capable of living. This is said
         of a child who is born alive in such an advanced state
         of formation as to be capable of living. Unless be is
         born viable he acquires no rights and cannot transmit
         them to his heirs, and is considered as if he had never
         been born.                               --Bouvier (Law
   [1913 Webster]
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