valediction

noun
🔊/ˌvælɪˈdɪkʃn/
🔊/ˌvælɪˈdɪkʃn/
[countable, uncountable] (formal)
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  1. the act of saying goodbye, especially in a formal speech(尤指正式演讲中的)告别,告别辞
    Word Originmid 17th cent.: based on Latin vale ‘goodbye’ + dicere ‘to say’, on the pattern of benediction.