Dean (noun)

1. An official in charge of a college or university faculty.
2. A senior official in a religious denomination, typically in charge of training clergy and administering church affairs.
3. The head of a chapter in a cathedral.

Origin:

Origin: old english dēn ‘chief of ten’ or ‘decan’, reinforced in middle english by old french deien, from late latin decanus ‘chief of ten’, from decem ‘ten’.

Examples:

1. The dean of the law school is responsible for overseeing the faculty and students.
2. The bishop appointed a new dean to lead the diocese.
3. The dean of the cathedral welcomed the congregation to the service.