Ascer*tain"a*ble*ness

from The Collaborative International Dictionary of English v.0.48

Ascertainable \As`cer*tain"a*ble\, a.
   That may be ascertained. -- {As`cer*tain"a*ble*ness}, n. --
   {As`cer*tain"a*bly}, adv.
   [1913 Webster]