Definition of valediction noun from the Oxford Advanced Learner's Dictionary

 

valediction

 noun
noun
BrE BrE//ˌvælɪˈdɪkʃn//
 
; NAmE NAmE//ˌvælɪˈdɪkʃn//
 
[countable, uncountable](formal)
 
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the act of saying goodbye, especially in a formal speech Word Origin mid 17th cent.: based on Latin vale ‘goodbye’ + dicere ‘to say’, on the pattern of benediction.
See the Oxford Advanced American Dictionary entry: valediction