adios
interjection
adi·os ˌä-dē-ˈōs 
ˌa-
—used to express farewell
Until we meet again, adios.
Example Sentences
Adios! We'll see you tomorrow.
Word History
Etymology
borrowed from Spanish adiós, earlier a Dios seas, a Dios seades, literally, "may (you) be (commended) to God"
First Known Use
1635, in the meaning defined above