An excerpt from a press release:

Salutatorian Dan-el Padilla Peralta, a classics major, delivered the salutatory address, which at Princeton is traditionally given in Latin and is the University's oldest student honor. The tradition dates back to an era when the entire Commencement ceremony was conducted in Latin. Although the Latin salutatory began as a serious, formal address, today it often includes humorous tributes, recollections and a farewell to Princeton campus life.

Because few students today know Latin, the new graduates follow along using printed copies of the remarks, complete with footnotes telling them when to applaud (applaudite), laugh (ridete) and shout loudly (acclamate magna voce). Guests and other audience members do not have the annotated copies, a practice dictated by tradition because the salute is directed to the members of the class.

Padilla, who is from New York, took a graduate-level course in Latin grammar as a sophomore -- the first of several graduate courses he took in the Department of Classics. As a recipient of the Daniel M. Sachs Class of 1960 Graduating Scholarship -- one of the highest honors given to Princeton undergraduates -- Padilla will enroll in Oxford University after graduation to read for a second bachelor's degree in classics.