Law is a system of rules that are created and enforced through social or governmental institutions to regulate behavior. It has been defined both as “the Science of Justice” and “the Art of Justice”. Law is a system that regulates and ensures that individuals or a community adhere to the will of the state..Double ‘Cane and Criminal Defense Attorney Roy Black to Speak at Commencement.Law definition is a binding custom or practice of a community a rule of conduct or action prescribed or formally recognized as binding or enforced by a controlling authority. How to use law in a sentence. Synonym Discussion of law..Law definition, the principles and regulations established in a community by some authority and applicable to its people, whether in the form of legislation or of custom and policies recognized and enforced by judicial decision. See more..