val·e·dic·to·ry /ˌvæləˈdɪktəri◂/ noun (plural valedictories) [countableC] formal GOODBYEa speech or statement in which you say goodbye when you are leaving a school, job etc, especially on a formal occasion 〔尤指在正式场合上的〕告别辞
—valedictory adjectiveadj a valedictory speech 告别演说