Definition - What does Natural Law mean?
Natural law refers to laws that are presumed to emanate from nature, and not from governments or the institutions of man.
In the context of American law, the Founding Fathers referred to natural law when saying, "We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty, and the pursuit of happiness."
Justipedia explains Natural Law
Natural law is commonly referenced during discussions of human ethics. There is debate among different religions, governments and other groups of people about what exactly constitutes a natural law. However, there is a basic presumption that natural law is all of the rights and expectations of humans that are given by the Creator or by nature.
However, natural law is sometimes referenced in the law of governments. For example, crimes against humanity and crimes against nature are often illegal.