Prefect (noun)

1. An official or officer in charge of a particular area or department.
2. A student appointed to a position of authority in some schools.

Origin:

The word "prefect" comes from the latin "praefectus" which means "in charge of, governor", it has been in use in english since the 16th century.

Examples:

1. He was appointed as the prefect of the department of justice.
2. The prefect of police is responsible for maintaining law and order in the city.
3. In some schools, prefects are appointed to maintain discipline and order among the students.
4. The prefect of the city was chosen by the governor.
5. The prefect of the province was responsible for maintaining peace and order.