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From The Collaborative International Dictionary of English v.0.48:
Outness \Out"ness\, n. 1. The state of being out or beyond; separateness. [1913 Webster] 2. (Metaph.) The state or quality of being distinguishable from the perceiving mind, by being in space, and possessing material quality; externality; objectivity. [1913 Webster] The outness of the objects of sense. --Sir W. Hamilton. [1913 Webster]