What is Burgomaster?

Legal Definition
Burgomaster (alternatively spelled burgomeister, literally master of the town, borough or master of the fortress) is the English form of various terms in or derived from Germanic languages for the chief magistrate or chairman of the executive council, usually of a sub-national level of administration such as a city or a similar entity. The name in English was derived from the Dutch burgemeester. In some cases, Burgomaster was the title of the head of state and head of government of a sovereign (or partially or de facto sovereign) city-state, sometimes combined with other titles (as in Hamburg's First Mayor and President of the Senate). Contemporary titles are commonly translated into English as mayor.
-- Wikipedia
Legal Definition
The title given in Germany to the chief executive officer of a borough, town or city; corresponding to our "mayor."
-- Black's Law Dictionary
Legal Definition
In Germany this is, the title by which an officer who performs the duties of a mayor is, called.
-- Bouviers Law Dictionary
Legal Definition
The chief magistrate of German or Dutch town.
-- Ballentine's Law Dictionary