Source : Webster's Revised Unabridged Dictionary (1913)

Objectiveness \Ob*jec"tive*ness\, n.
   Objectivity.

         Is there such a motion or objectiveness of external
         bodies, which produceth light?           --Sir M. Hale

Source : WordNet®

objectiveness
     n : judgment based on observable phenomena and uninfluenced by
         emotions or personal prejudices [syn: {objectivity}]