Etymology
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valediction (n.)
"a farewell, a bidding farewell," 1610s, from past participle stem of Latin valedicere "bid farewell, take leave," from vale "farewell!," second person singular imperative of valere "be well, be strong" (from PIE root *wal- "to be strong") + dicere "to say" (from PIE root *deik- "to show," also "pronounce solemnly").
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valedictory (adj.)
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.
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