From The Collaborative International Dictionary of English v.0.48:

Variability \Va`ri*a*bil"i*ty\, n. [Cf. F. variabilit['e].]
   1. The quality or state of being variable; variableness.
      [1913 Webster]

   2. (Biol.) The power possessed by living organisms, both
      animal and vegetable, of adapting themselves to
      modifications or changes in their environment, thus
      possibly giving rise to ultimate variation of structure or
      [1913 Webster]
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