adieu
/əˈduː/
interjection
- Used to say goodbye; farewell.
- She whispered adieu as she closed the door for the last time.
- Adieu, my friend, until we meet again.
- The knight bid adieu to his family before riding off to battle.
noun
- A farewell, especially a formal or final one.
- The party was a warm adieu to the retiring teacher.
- He wrote a heartfelt adieu in his letter.
- They said their adieus at the train station.