Webster’s Revised Unabridged Dictionary · 1913
Outness
Out′ness (out′nĕs), 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.