adieu

Etymology

From Middle English adieu also adew, adewe, adue, from Old French adieu (“to God”), a shortening of a Dieu vous comant (“I commend you to God”), from Medieval Latin ad Deum (“to God”). Doublet of adios.

intj

1. Said to wish a final farewell; goodbye.

noun

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
   At the of his so remote, so near, 1884 summer Van, before leaving Ardis, was to make a visit of adieu to Ada's larvarium. 1969, Vladimir Nabokov, Ada or Ardor: A Family Chronicle