adieu
n. C1 Advanced US //əˈdu// UK //ɐdjˈuː// adieu
n. a formal way to say goodbye. You use it when you are leaving someone or something for a long time.
n. a formal or poetic expression of farewell. Often used in literary or historical contexts to signify a permanent departure.
He said adieu to his old life and moved to a new country.
As the ship pulled away from the harbor, the captain stood on the deck and shouted a final adieu to his hometown.
The poet's final collection is a series of elegies, each one a heartfelt adieu to a different era of his life spent in the quiet countryside.
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.