Final answer:
A written plan of government including its structure and powers is a Constitution. Constitutions define the relationship between people and their government, and serve as the basis for any other laws or government activities.
Step-by-step explanation:
A written plan of government including its structure and powers is a Constitution. Constitutions can be written, partly unwritten, or completely unwritten, and can be single documents or combinations of documents, customs, and traditions. Constitutions define the relationship between people and their government, give powers to and place limits upon the government, and serve as the basis for any other laws or government activities.