Adieu

Definition:

(interj. & adv.) Good-by; farewell; an expression of kind wishes at parting.
(n.) A farewell; commendation to the care of God at parting.

Compare adieu with other words:

adieu vs. valediction

adieu vs. shalom

adieu vs. sayonara

adieu vs. cheers

adieu vs. cheerio

adieu vs. arrivederci

adieu vs. aloha

adieu vs. adios

addio vs. adieu

adieu vs. farewell

adieu vs. goodbye