valedictory

adj. of or pertaining to a valediction, of or about a farewell speech

n. ceremonious farewell speech

Valedictorian is an academic title typically conferred upon the highest ranked student within the graduating class of an educational institution. The term is an anglicized derivation of the Latin vale dicere ("to say farewell"), historically rooted in the valedictorian's traditional role as the final speaker at the graduation ceremony. The valedictory address is generally considered a final farewell to classmates, before they disperse as a collective group in order to pursue their individual paths after graduating. The title of class valedictorian is common in educational institutions in the United States and Canada, while its equivalent in Australia and New Zealand is dux.
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Noun
1. a farewell oration delivered by the most outstanding member of a graduating class
(synonym) valediction, valedictory address
(hypernym) oratory
Adjective
1. of or relating to an occasion or expression of farewell; "a valedictory address"; "valedictory praise for his uniformly manly course"; "a suitable valedictory gesture"
(pertainym) valediction
2. of a speech expressing leave-taking; "a valedictory address"
(similar) exaugural

adj. valedictory, of or about a farewell speech

(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.
  

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