A government is the organization, or agency through which a political unit exercises its authority, controls and administers public policy, and directs and controls the actions of its members or subjects.
A government is a body of people who legislate, execute, and judge by the laws regulating the actions of a society residing within its geographical boundaries.
Divided government is when one party controls the White House and another party controls one or both chambers of Congress. Pundits believe divided government to be an undesirable result of separation...
a country has a unitary government if all the power is in one central agency. This happens a lot in a dictatorship, but some democracies also have them, like Great Britain.