farewell address; valedictory speech
A formal speech or message given when leaving a position, organization, or gathering. Often used in official or ceremonial contexts.
The president gave a farewell address upon retirement.
I was assigned to read the valedictory speech at the graduation ceremony.
Composed of 告 (announce, inform) and 辞 (words, speech), literally 'announcing words'. The exact historical derivation is uncertain, but the spelling is conventionally associated with a formal farewell speech.