Definitions:

1. A farewell, especially a formal statement or act of saying goodbye, often at the end of a speech, letter, or ceremony. NOUN
   • The moving valediction brought the entire audience to tears.
2. A word or phrase said upon leaving. NOUN
   • The valedictorian delivered a thoughtful valediction to the graduating class.
3. The action of saying farewell. NOUN
   • He spread his palm in valediction.

Synonyms:

• farewell
• goodbye
• parting words
• send-off