President is a common title for the
head of state in most
republics. The president of a nation is, generally speaking, the head of the government and the fundamental leader of the country or the ceremonial head of state.

The functions exercised by a president vary according to the form of
government. In
parliamentary republic
A parliamentary republic is a republic that operates under a parliamentary system of government where the executive branch (the government) derives its legitimacy from and is accountable to the legislature (the parliament). There are a number ...
s, they are usually, but not always, limited to those of the head of state and are thus largely ceremonial. In
presidential
President most commonly refers to:
*President (corporate title)
*President (education), a leader of a college or university
* President (government title)
President may also refer to:
Automobiles
* Nissan President, a 1966–2010 Japanese fu ...
, selected parliamentary (e.g.
Botswana and
South Africa), and
semi-presidential republics, the role of the president is more prominent, encompassing also (in most cases) the functions of the
head of government.
In authoritarian regimes, a
dictator or leader of a
one-party state may also be called a president.
The titles "Mr. President" and Madam President may apply to a person holding the title of president or presiding over certain other governmental bodies. "Mr. President" has subsequently been used by governments to refer to their heads of state. It is the conventional translation of non-
English titles such as ''Monsieur le Président'' for the
president of the French Republic. It also has a long history of usage as the title of the presiding officers of legislative and judicial bodies. The