|1.||an ethical belief or system of beliefs supposed to be inherent in human nature and discoverable by reason rather than revelation|
|2.||See also nomological a nonlogically necessary truth; law of nature|
|3.||the philosophical doctrine that the authority of the legal system or of certain laws derives from their justifiability by reason, and indeed that a legal system which cannot be so justified has no authority|
The doctrine that human affairs should be governed by ethical principles that are part of the very nature of things and that can be understood by reason. The first two paragraphs of the Declaration of Independence contain a clear statement of the doctrine.