A presidential system is a system of government where an executive branch exists and presides (hence the name) separately from the legislature, to which it is not responsible and which cannot, in normal circumstances, dismiss it.
The concept of separate spheres of influence of the executive and legislature is specified in the Constitution of the United States, with the creation of the office of President of the United States elected separately from Congress.
Although not exclusive to republics, and applied in the case of semi-constitutional monarchies where a monarch exercises power (both as head of state and chief of the executive branch of government) alongside a legislature, the term is often associated with republican systems in the Americas.
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