Philosophy. A thing which is perceived, thought of, known, etc.; spec. a thing which is external to or distinct from the apprehending mind…

A thing or class of things external to or independent of the mind; an object of conscious thought; that which is objective (sense A. 3b).

The quality or fact of being other; difference, esp. from an expected norm; separateness from or oppositeness to a (frequently specified) thing…

(un-, prefix1 affix 6.)

That which is not the ego or conscious self; the object (object, n. 5), as opposed to the conscious thinking subject. Cf. not-I, n., not-self, n.

That which is other than self; something different from the conscious self; the non-ego.

That which is outside the self. Obsolete. rare.