valediction

nouns

a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)
valediction, valedictory, valedictory address, valedictory oration
the act of saying farewell
valediction
is a type of (narrower)
the act of departing politely
"he disliked long farewells"; "he took his leave"; "parting is such sweet sorrow"
farewell, leave, leave-taking, parting