valediction/ˌvælɪˈdɪkʃn; ˌvælə`dɪkʃən/ n[C, U](fml 文) (words used in) saying farewell, esp on serious occasions 告别; 告辞; 告别辞 utter a valediction 致告别辞 bow in valediction 鞠躬告别.
牛津英汉双解词典