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A word or phrase, such as Yours truly, placed at the end of a letter or email message before the writer's signature as a polite gesture.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
also com′plimen′tary clos′ing,
the part of a letter that by convention immediately precedes the signature, as “Very truly yours,” “Cordially,” or “Sincerely yours.”
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.