constitution
Oxford:
the system of laws and basic principles that a state, a country or an organization is governed by
Webster:
the system of beliefs and laws by which a country, state, or organization is governed
Cambridge:
the set of laws and principles that a country's government must obey
Longman:
a set of basic laws and principles that a country or organization is governed by
Macmillan:
a set of basic laws or principles for a country that describe the rights and duties of its citizens and the way in which it is governed