Source : Webster's Revised Unabridged Dictionary (1913)

Durability \Du`ra*bil"i*ty\, n. [L. durabilitas.]
   The state or quality of being durable; the power of
   uninterrupted or long continuance in any condition; the power
   of resisting agents or influences which tend to cause
   changes, decay, or dissolution; lastingness.

         A Gothic cathedral raises ideas of grandeur in our
         minds by the size, its height, . . . its antiquity, and
         its durability.                          --Blair.

Source : WordNet®

durability
     n : permanence by virtue of the power to resist stress or force;
         "they advertised the durability of their products" [syn:
         {lastingness}, {enduringness}, {strength}]