John Austin says: A law is a rule of conduct imposed and enforced by the sovereign.
According to Salmond: Law is the body of principles recognized and applied by the state of administration of Justice.
According to Justice Holms: Law is that what Justice says in his decision.
According to Roscoe Pound: Law is the body of principles, recognized or enforced by public and regular tribunals in the administration of Justice.
Lawrence, Robert and Peter State that: The law refers to the body of philosophy, principles, standards and rules which the Courts apply in deciding cases brought before them.
On the basis of above said several definitions, it can be said the term law cannot be defined unanimously. Some Scholars have defined law in the narrow sense and some have defined in wider sense. It is impossible to formulate commonly accepted single definition of law because there are several schools of thought concerning to it. Eminent Jurist H.L.A Hart also accepts this fact that the definition of law is very difficult task.
At the Summing up, it can be said that to define the term of law is very difficult task. Besides this, many eminent scholars have made various efforts. Comparatively a definition given by Black Stone is wider than others; who affirms that "Law in its most general and comprehensive sense signifies a rule of action, and is applied indiscriminately to all kinds of action, whether animate or inanimate, rational or irrational".
In conclusion, it can be said that the essence and core of all definitions is similar. Law is a set of rules and principles made by sovereign power through legitimate process to control or regulate the society for justice, peaceful living and social security.