A more thorough explanation:

A magisterial precinct is a subdivision of a county that defines the territorial jurisdiction of a magistrate, constable, or justice of the peace. It is also known as a magisterial district.

For example, in Virginia, magisterial precincts are used to determine the boundaries of voting districts and the jurisdiction of magistrates and constables. Each precinct is assigned a number and a polling place for elections.

Another example is in Pennsylvania, where magisterial districts are used to determine the jurisdiction of justices of the peace. Each district has its own court and judge, who handle minor criminal offenses and civil cases.

Overall, magisterial precincts are important for organizing and administering local government services and justice systems.