Separation of powers refers to an organizational structure that delegates certain powers to certain people or groups. This structure is a fundamental part of U.S. government where each branch of government has separate powers and responsibilities, independent of the other branches.
A bipartite democratic system of government has two levels of separation of powers. There is a group of elected representatives, or General Court, who in turn elect a governor.
Here are examples of a bipartite system in early American colonies:
A tripartite system of government usually has executive, legislative and judicial branches.
Here are examples of governments with three branches:
Now you have seen how power can be split in different contexts among different people and groups.