1. (noun)valediction, valedictory address, valedictory oration, valedictory a farewelloration (especially one delivered during graduation exercises by an outstanding member of a graduating class)
2. (adj)valedictory of or relating to an occasion or expression of farewell "a valedictory address"; "valedictory praise for his uniformly manly course"; "a suitable valedictory gesture"
3. (adj)valedictory of a speech expressing leave-taking "a valedictory address"