Emeritus

[Sarah]

Honorably discharged from the performance of public duty onaccount of age, infirmity, or long and faithful services; -- said ofan officer of a college or pastor of a church.

[Sarah]

(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.

[Ernesto]

no longer having a position, especially in a college or university, but keeping the title of the position:

[Sonia]

(of the former holder of an office, especially a college professor) having retired but allowed to retain their title as an honor.