An ad eundem degree is an academic degree awarded by one university or college to an alumnus of another, in a process often known as incorporation. The recipient of the ad eundem degree is often a faculty member at the institution which awards the degree, e.g. at the University of Cambridge, where incorporation is expressly limited to a person who "has been admitted to a University office or a Headship or a Fellowship (other than an Honorary Fellowship) of a College, or holds a post in the University Press [...] or is a Head-elect or designate of a College".
The ad eundem degree is an earned degree, not an honorary one, because it recognises formal learning. As it is a separate substantive degree, it is also acceptable to list both the original degree(s) and the incorporated ("ad eundem") degree when listing post-nominals.
Before modern transport had shrunk the world, it was common, when a graduate from one university moved into the neighborhood of another, for the new university to admit the graduate as a courtesy, "at the same degree" (in Latin, ad eundem gradum). Thus if someone was a bachelor of arts in the university that they had attended, they would likewise be a bachelor of arts of their new university. (Not every college extended this courtesy to all other colleges, however.)
The practice of incorporation diminished in the early-19th century, but it continues at the University of Oxford, the University of Cambridge, and Trinity College, Dublin. At the University of Oxford, incorporation first appears in the University Statutes in 1516, though the practice itself is older: In the 15th and early 16th centuries, incorporation was granted to members of universities from all over Europe. This continued until the 19th century, when in 1861 incorporation was restricted to members of Cambridge University and Trinity College, Dublin. In 1908, incorporation was further restricted to specific degrees from these universities.
A number of female students at Oxford and Cambridge were awarded ad eundem University of Dublin degrees at Trinity College, Dublin, between 1904 and 1907, at a time when their own universities refused to confer degrees upon women.
Several US universities, including Harvard, Yale, Brown, Penn, Dartmouth, and Wesleyan, follow a tradition that only alumni may be faculty (or sometimes that only alumni can be tenured faculty). Faculty who do not hold an earned degree are therefore awarded an honorary master's degree, often abbreviated M.A.H. or M.A.A., ut in grege nostro numeretur ("so that (s)he may be numbered in our flock") as the degrees are described at Harvard. At Amherst College a similar custom is followed, with the granting of a master of arts degree by the college to its faculty even though the college grants only bachelor's degrees (AB) to its own matriculated students. Because these degrees do not involve any further study, most faculty members do not list them on their curricula vitae.
Rhodes University in South Africa uses the term "ad eundem gradum" to give a student status to undertake a research higher degree based on experience, as opposed to an explicit qualification. In this case the student does not acquire a qualification, but is exempt from an entry requirement. In yet another variation, the University of Sydney may confer an ad eundem gradum degree on a retiring staff member (academic or otherwise) who has had at least 10 years' service and is not a Sydney graduate, though in this case, the Sydney award is at the same level as an existing qualification.