adieu

Interjection

1. Said to wish a final farewell; goodbye.
   • BEATRICE. What fire is in mine ears? Can this be true?
     Stand I condemn'd for pride and scorn so much?
     Contempt, farewell! and maiden pride, adieu!
     No glory lives behind the back of such.1598–1599 (first performance), William Shakespeare, “Much Adoe about Nothing”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward]...
   • The sails of fat-bellied ships go upward and flap signalling that time has come to bid adieu to the voyagers.2022, “Untold story of Odias who conquered Land of Gold way before Cholas”, in OrrisaPost

   Synonyms:

   addio, adios, con dios, God be with you, good-by, good-bye, goodbye, go with God, vaya con dios, adjö

Noun

adieu (plural adieux or adieus)

1. A farewell, a goodbye; especially a fond farewell, or a lasting or permanent farewell.
   • We bid our final adieus to our family, then boarded the ship, bound for America.
   • As Noyes bade me adieu and rode off northward in his car I began to walk slowly toward the house.1931, H. P. Lovecraft, chapter 6, in The Whisperer in Darkness