noun
valediction
val-i-DIK-shun/ˌvælɪˈdɪkʃn/
An act or expression of saying goodbye.
The traveler waves back at the woman in a silent valediction.

Etymology
The first element supplies Latin vale!, literally “be well!”, used as a farewell. Combined with “say,” it makes a valediction an act of wishing someone well on taking leave.
In context
when i was asked to deliver this valediction i felt honored
More examples
- She ends her letter with the simple valediction, “Until we meet again.”
- His retirement speech includes a heartfelt valediction to his colleagues.
- Their hurried valedictions leave little time for tears.
Forms
valediction · valedictions
valedictory adjective — Expressing farewell on a formal occasion.