A dignitary or presiding officer in certain ecclesiastical
and lay bodies; esp., an ecclesiastical dignitary, subordinate to a
bishop.

The collegiate officer in the universities of Oxford and
Cambridge, England, who, besides other duties, has regard to the moral
condition of the college.

The head or presiding officer in the faculty of some colleges
or universities.

A registrar or secretary of the faculty in a department of a
college, as in a medical, or theological, or scientific department.

The chief or senior of a company on occasion of ceremony; as,
the dean of the diplomatic corps; – so called by courtesy.