arriverderci
It's actually an Italian word, and it is spelled Ciao. It can mean both hello and goodbye. While it is an Italian word, it is also a spanish word. I am from Bolivia and we spell it chao and it means goodbye. It is a pretty informal way of saying goodbye similar to a "later" in English. Can be used in place of "adios".
The most powerful thing someone can take from you is the love you have for someone or for yourself.
Adios
goodby
au revoir
antio
Tot ziens!
Adios - Goodbye
In Russian, "goodbye" is translated as "до свидания" (pronounced as "do svidaniya").
Au revoir
adios amigos
Hallo Totsiens