Valedictory a. : Bidding farewell; suitable or designed for an occasion of leave-taking; as, a valedictory oration.

Valedictory n. : A valedictory oration or address spoken at commencement in American colleges or seminaries by one of the graduating class, usually by the leading scholar.

Example:
How to write a Valedictory e-mail message to all concerned?

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Defination from the web:
valedictory from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "valedictory" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this ...