The Rule of Law (or Law and Order) is a principle of the constitution in which the law applies equally to all and that the law is certain.
Reference Definition by Oxford English Dictionary: The authority and influence of law in society, especially when viewed as a constraint on individual and institutional behavior; (hence) the principle whereby all members of a society (including those in government) are considered equally subject to publicly disclosed legal codes and processes.
Related Definitions in the Project: The Project Management