Definitions for public law
Random House Webster's College Dictionary
a law or statute that applies to all the people of a state or nation.
the laws dealing with individuals and the state or with relations among government agencies.
Ref: Compare private law. 1
a law affecting the public at large
A category of law governing the relationship between the state on one hand and persons (citizens or legal persons including corporations) on the other. Constitutional law, administrative law and criminal law are some of the major subdivisions of public law.