valedictory (adj.)youdaoicibaDictYouDict[valedictory 词源字典]
1650s, "pertaining or relating to leave-taking," from Latin valedictum (past participle of valedicere; see valediction) + -ory. As a noun meaning "valedictory address" from 1779.[valedictory etymology, valedictory origin, 英语词源]