Emtiness

On the intellectual level, it can be said that emptiness means that all dharmas – all phenomena, mental and physical – lack an independent existence of their own and exist only through reliance on other phenomena. All dharmas lack real, permanent, essential attributes that distinguish them from all other phenomena. In other words, everything in the world, both physical and mental, is interdependent. Nothing exists entirely on its own, separate, and with no causal relation to anything else. Thus all dharmas are empty of any individual, inherent being.

---Buddhist Text Translation Society---