valediction
noun/ˌvælɪˈdɪkʃn/
/ˌvælɪˈdɪkʃn/
[countable, uncountable] (formal)- the act of saying goodbye, especially in a formal speechWord Originmid 17th cent.: based on Latin vale ‘goodbye’ + dicere ‘to say’, on the pattern of benediction.
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valediction