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1590s, "office of a president," from Medieval Latin praesidentia "office of a president" (mid-13c.), from Latin praesidentem (nominative praesidens) "president, governor" (see president). Earlier in same sense was presidentship (1520s). Meaning "a president's term in office" is from 1610s.
chief executive office of the United States. In contrast to many countries with parliamentary forms of government, where the office of president, or head of state, is mainly ceremonial, in the United States the president is vested with great authority and is arguably the most powerful elected official in the world. The nation's founders originally intended the presidency to be a narrowly restricted institution. They distrusted executive authority because their experience with colonial governors had taught them that executive power was inimical to liberty, because they felt betrayed by the actions of George III, the king of Great Britain and Ireland, and because they considered a strong executive incompatible with the republicanism embraced in the Declaration of Independence (1776). Accordingly, their revolutionary state constitutions provided for only nominal executive branches, and the Articles of Confederation (1781-89), the first "national" constitution, established no executive branch. For coverage of the 2008 election, see United States Presidential Election of 2008.