System of governing or ruling; constitution or practices of a government. Refers to a certain type of power and social administration as distinct from the stage of socioeconomic development and the social nature of the State. It is a historical form of power, of the mechanism of power understood as the process of administration or governing. There are democratic (presidential and parliamentary), authoritarian and totalitarian regimes. A given form of State (monarchy, republic, etc.) can have different political regimes during different periods of its existence, ranging from parliamentarian to dictatorial. Thus, the concept of r. possesses a high degree of dynamism, and the social nature of the State may remain unchanged even while the political r. may vary.