val·e·dic·tion /ˌvæləˈdɪkʃən/
  告別,告別詞
  Val·e·dic·tion n.  A farewell; a bidding farewell.
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  valediction
       n 1: a farewell oration delivered by the most outstanding member
            of a graduating class [syn: valedictory address, valedictory]
       2: the act of saying farewell