valedictory

nouns

a farewell oration (especially one delivered during graduation exercises by an outstanding member of a graduating class)

adjectives

of or relating to an occasion or expression of farewell
"a valedictory address"; "valedictory praise for his uniformly manly course"; "a suitable valedictory gesture"
pertains to
of a speech expressing leave-taking
"a valedictory address"
is similar to
occurring at or marking the close of a term of office
"an exaugural message"