Source : Webster's Revised Unabridged Dictionary (1913)

Imperishability \Im*per`ish*a*bil"i*ty\, n.
   The quality of being imperishable: indstructibility. ``The
   imperishability of the universe.'' --Milman.

Source : WordNet®

imperishability
     n : the property of being resistant to decay; "he advertised the
         imperishability of the product" [syn: {imperishingness}]