A word or phrase of farewell used to end a letter or message.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "valediction" in a sentence
"Roth gives the best lines in valediction to a pro-war speechmaker, the unpolished Republican pol Albin Lentz, who is the president of Winesburg College."
""You obviously don't know what you're talking about, brother", he added in valediction, which is somewhat ironic, as Mr Hjelms was trying to explain how he knew what he was talking about."
"The gist of the story is that using big words like "valediction" (or "Ahmadinejad") can sometimes con an audience into thinking things make sense when in fact they don't."