A more thorough explanation:

DECANIA

Decania is a term used in Law Latin to refer to a dean's office or territory.

One example of decania is the decania of the Faculty of Arts and Sciences at Harvard University. This refers to the office and territory of the dean of that faculty.

Another example is the decania of the Faculty of Law at the University of Oxford. This refers to the office and territory of the dean of that faculty.

These examples illustrate how decania is used to refer to the office and territory of a dean. It is a term that is commonly used in academic settings to refer to the administrative unit headed by a dean.