valediction [ˌvælɪˈdɪkʃən]

例句:

• A gesture of dignified valediction before departure into the unknown.
  来自R. Macaulay
• He gave a touching valediction at graduation.
  他在毕业典礼上发表了动人的告别辞.
  
• She will give a touching valediction at graduation.
  她将在毕业典礼作感人的告别演讲.
  
• It is a bitter valediction for the birth of the new learning.
  来自NEWYORKER
• But "FILM" never felt like a valediction.
  来自NEWYORKER