Abdication is the act of formally relinquishing monarchical authority.
The word abdication derives from the Latin abdicatio meaning to disown or renounce (from ab, away from, and dicare, to dedicate or relinquish). In its broadest sense abdication is the act of renouncing and resigning from any formal office, but it is applied especially to the supreme office of state. In Roman law the term was also applied to the disowning of a family member, such as the disinheriting of a son. Today the term commonly applies to monarchs, or to those who have been formally crowned. An elected or appointed official is said to resign rather than to abdicate.
Among the most notable abdications of antiquity are those of Lucius Cornelius Sulla, the Dictator, in 79 BC, Emperor Diocletian in AD 305, and Emperor Romulus Augustulus in AD 476.
Perhaps the most notable abdication in recent history is that of King Edward VIII of the United Kingdom and the Dominions. In 1936 Edward abdicated to marry American divorcée Wallis Simpson, over the objections of the British establishment, the governments of the Commonwealth, the Royal Family and the Church of England. It was the first time in history that the British or English crown was surrendered entirely voluntarily. Richard II of England, for example, was forced to abdicate after power was seized by his cousin, Henry Bolingbroke, while Richard was abroad.