Answer:
A constitution is a document that is the establising of something.
Step-by-step 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.