Legal Definition of Natural: Pertaining to nature and to the operation of natural law. (Natural law does not originate from enacted laws and statutes but from the inner instincts and desires of human beings.) | Learn about the legal definition of natural and why it’s important for business owners. Discover how natural applies to actions and phenomena in accordance with the laws of nature, as well as inherent rights. By understanding this concept, you can ensure compliance, navigate contracts, and make ethical decisions that align with natural law