A composition of something , a written record of a body of fundamental principles or established precedents according to which a state or other organization is acknowledged to be governed.
The US Constitution specifies the powers and duties of each branch of government. The Constitution reserves all unenumerated powers to the respective states and the people, thereby establishing the federal system of government. The Constitution does not give freedoms, it takes them away. What the Constitution does not take away from the people, it leaves for the states. The Bill of rights protects the rights of the people from the Constitution.
Constitution 14c law, regulation, edict, act of settling, settled condition, anything arranged or settled upon, regulation, order, ordinance Action of establishing, is from 1580s; that of "way in which a thing is constituted" is from c.1600;. Sense of "mode of organization of a state" is from c.1600; that of "system of principles by which a community is governed" dates from 1730s; especially of a document of written laws since the U.S. and French constitutions, late 18c. 
constitute 14c made up, formed, arranged, settled, to cause to stand, set up, fix, place, establish, set in order; form something new; resolve.