Definition from Wiktionary, the free dictionary
dean (plural deans)
- A senior official in a college or university, who may be in charge of a division or faculty (for example, the dean of science) or have some other advisory or disciplinary function (for example, the dean of students).
- A dignitary or presiding officer in certain church bodies, especially an ecclesiastical dignitary, subordinate to a bishop, in charge of a chapter of canon.
- The senior member of some group of people.
- dean of the diplomatic corps - a country's most senior ambassador
- dean of the House - the longest-serving member of a legislature
- (Sussex) a hill (chiefly place names).
Related terms 
Derived terms 
senior official in college or university
senior member of a group
- third-person plural present subjunctive of dar