Define Constitution.

A constitution is a body of fundamental principles according to which a state is constituted or governed. 

The vast majority of contemporary constitutions describe the basic principles of the state, the structures and processes of government and the fundamental rights of citizens in a higher law that cannot be unilaterally changed by an ordinary legislative act. This higher law is usually referred to as a constitution.

The content and nature of a particular constitution, as well as how it relates to the rest

of the legal and political order, varies considerably between countries, and there is no

universal and uncontested definition of a constitution.