De facto

De facto is a Latin expression that means "in fact" or "in practice", commonly used as opposed to de jure (meaning "by law") when referring to matters of law or governance[?] or technique (such as standards), that are found in the common experience as created or developed without or against a regulation.

A de facto standard, for instance, is a technical or other standard that is so dominant that everybody seems to follow it like an authorized standard. The de jure standard may be different: one example is the metric unit of kilometre, which is the de jure standard for road distances in the United States, while the mile (1.609 * 10³ meters) is the de facto standard. In addition, there is no law preventing one from adding a twenty-seventh letter such as þ to the alphabet, as letters were added, centuries ago, without much difficulty, but one is prevented from doing so today by the practical difficulties involved. Thus there is a de facto limit on modifications to the alphabet. The de facto standard is not even formalized in all cases and may simply rely on the fact that someone has come up with a good (hopefully unpatented) idea that everybody else likes so much that it is copied/plagiarized. Typical creators of de facto-standards are individual companies, corporations and consortiums[?].

In politics, one speaks of a de facto leader of a country or region, meaning one who has illegally assumed authority, typically by deposing a previous leader or undermining the rule of a current one. De facto leaders do not usually hold a constitutional office, and exercise power in an informal manner. It is important to note that not all dictators are de facto rulers. Many current and past dictators have initially emerged as de facto leaders, but later formalize their rule through constitutional revisions. For example, Augusto Pinochet of Chile initally came to power as the chairman of a military junta, but then later switched his title to president, making him the formal and legal ruler of Chile.

Some notable true de facto leaders have been Deng Xiaoping of China and General Manuel Noriega of Panama. Both of these men exercised near total control over their respective nations for many years despite not having the legal authority to do so.

Another common usage of the term de facto is "de facto segregation": Users of a given library or school tend to be residents of that neighborhood, and thus such facilities tend to become racially or ethnically segregated without "de jure segregation" (which would require segregation by force of law).

See also: List of Latin phrases