Authority is the power or right to make rules or laws. It is derived from the Latin word auctoritas and as such many of its concepts originate from Roman Law. It is often used interchangeably with the term "power" yet the meanings differ. "Power" refers to the ability to achieve certain ends, "authority" refers to the legitimacy, justification and right to exercise that power. For example whilst a mob has the power to punish a criminal, such as through lynching, only the courts have the authority to order capital punishment.
Related to this definition it has also come to mean:
In Weberian sociology, authority comprises a particular type of power. The dominant usage comes from functionalism, defining authority as power which is recognised as legitimate and justified by both the powerful and the powerless. Weber divided authority into three types:
Giorgio Agamben (2005) wrote "auctoritas has nothing to do with magistrates or the people's potestas or imperium. The Senator… is not a magistrate".
Within conflict theory, "authority" is used both in the same sense as Weber's functionalist definition above and in a rather different sense. The latter is based on the observation that power is almost never endorsed in a moral sense by those who do not have it, and therefore this school of thought defines "authority" as power which is so institutionalised that it is largely unquestioned.
Obedience to authority seems thoroughly ingrained in most of the population: the Milgram experiment showed that over 60% of a sample of Americans demonstrated willingness to severely torture another person when given orders from an appropriate authority figure. This experiment produced similar results when replicated in several other cultures. A similar effect was found in the Stanford prison experiment.