Source : Webster's Revised Unabridged Dictionary (1913)

Tractability \Tract`a*bil"i*ty\, n. [L. tractabilitas: cf.F.
   tractabilite.]
   The quality or state of being tractable or docile; docility;
   tractableness.

Source : WordNet®

tractability
     n : the trait of being easily persuaded [syn: {tractableness}, {flexibility}]
         [ant: {intractability}]