Source : Webster's Revised Unabridged Dictionary (1913)

Innumerable \In*nu`mer*a*ble\, a. [L. innumerabilis : cf.F.
   innumefable. See {In-} not, and {Numerable}.]
   Not capable of being counted, enumerated, or numbered, for
   multitude; countless; numberless; unnumbered, hence,
   indefinitely numerous; of great number.

         Innumerable as the stars of night.       --Milton.
   -- {In*nu"mer*a*ble*ness}, n. -- {In*nu"mer*a*bly}, adv.

Source : WordNet®

innumerableness
     n : a number beyond counting [syn: {countlessness}]