What is a constitution?

A constitution is a document that is the establising of something.

Explanation:

1 a body of fundamental principles or established precedents according to which a state or other organization is acknowledged to be governed: Britain lacks a codified constitution.

• (the Constitution) the basic written set of principles and precedents of federal government in the US, which came into operation in 1789 and has since been modified by twenty-seven amendments.

2 the composition of something: the genetic constitution of a species.

• the forming or establishing of something: the constitution of a police authority.

3 a person's physical state with regard to vitality, health, and strength: pregnancy had weakened her constitution.

• a person's mental or psychological makeup: the individual's constitution is commonly described as his nature.