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(1) The capacity of being alive; capability of living, developing, or reproducing.

(2) The capability (of an embryo, fetus or newborn) of normal growth and development outside the uterus.

(3) The state of being viable; practicability.


Viability with biological context can refer to the following:

  • In biological research and experimentation, viability refers to a measure of cells that are alive.
  • In pregnancy, viability refers to the chance of reaching full-tem or the shortest possible length of pregnancy that would deliver a live birth and in which the newborn is capable of normal growth and development.

Word origin: viable + -ity.
Related forms: viable (adjective)

Compare: inviability