arriverderci
In Russian, "goodbye" is translated as "до свидания" (pronounced as "do svidaniya").
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".
antio
au revoir
Adios
Au revoir
Adios - Goodbye
Tot ziens!
Hallo Totsiens
adios amigos
Vale! (to singular) Valete! (to plural)
Mark Wilson "Goodby"