Va`ri*a*bil"i*ty (?), n. [Cf. F. variabilité.]

1. The quality or state of being variable; variableness.

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 function.

Va`ri*a*bil"i*ty (?), n. [Cf. F. variabilité.]

1. The quality or state of being variable; variableness.

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 function.

• the state or characteristic of being variable
  
• the degree to which a thing is variable