valediction
n. 告别演说;告别词
例句
I came here just for a valediction.
我来仅仅是向你告别。
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。