adaptability

from WordNet (r) 3.0 (2006)

adaptability
    n 1: the ability to change (or be changed) to fit changed
         circumstances [ant: {unadaptability}]

from The Collaborative International Dictionary of English v.0.48

Adaptability \A*dapt`a*bil"i*ty\, Adaptableness
\A*dapt"a*ble*ness\, n.
   The quality of being adaptable; suitableness. "General
   adaptability for every purpose." --Farrar.
   [1913 Webster]