|Origin:||deien, from Late Latin decanus 'person in charge of ten others', from Latin decem 'ten'|
a priest of high rank in the Christian church who is in charge of several priests or churches
someone in a university who is responsible for a particular area of work:
the admissions dean
3 American English
someone with a lot of experience of a particular job or subject [= doyen British English]
Neier is the dean of American human rights activism.