(n)One who is retired but retains an honorary title corresponding to that held immediately before retirement
noun plural: Emeriti
(adj.)honourably retired from assigned duties and retaining your title along with the additional title `emeritus' as in `professor emeritus'; `retired from assigned duties' need not imply that one is inactive
(adj)Retired but retaining an honorary title corresponding to that held immediately before retirement: a professor emeritus
Upon his retirement as a teaching professor from the university, Dr. Johansen became Professor Emeritus of the Law School and consulted with the instructors on a semi-regular basis.
(V) Old, retired professor who thinks they can be a dickhead and nothing will come of it. Usually found in droves at Land Grant Institutions.
First person: "Damnit! I got an F on that test I studied all night for."
Second person: "I know, that old codger, emeritus professor just makes things up to test on.