Source : Webster's Revised Unabridged Dictionary (1913)

Outness \Out"ness\, n.
   1. The state of being out or beyond; separateness.

   2. (Metaph.) The state or quality of being distanguishable
      from the perceiving mind, by being in space, and
      possessing marerial quality; externality; objectivity.

            The outness of the objects of sense.  --Sir W.
                                                  Hamiltom.