Synonyms for Valedictory (same or very similar meaning)
WordNet sense 1 (a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)):
valediction, valedictory address, valedictory orationWordNet sense 2 (occurring at or marking the close of a term of office):
exauguralFrom the ODE community, based on WordNetadd/edit