Be-ness. A term coined by Theosophists to render more accurately the essential meaning of the untranslatable word Sat. The latter word does not mean “Being” for it presupposes a sentient feeling or some consciousness of existence. But, as the term Sat is applied solely to the absolute Principle, the universal, unknown, and ever unknowable Presence, which philosophical Pantheism postulates in Kosmos, calling it the basic root of Kosmos. and Kosmos itself— “Being” was no fit word to express it. Indeed, the latter is not even, as translated by some Orientalists, “the incomprehensible Entity”; for it is no more an Entity than a non-Entity, but both. It is, as said, absolute Be-ness, not Being, the one secondless, undivided, and indivisible All—the root of all Nature visible and invisible, objective and subjective, to be sensed by the highest spiritual intuition, but’ never to be fully comprehended.
Source: H.P.Blavatsky - The Theosophical Glossary