In contrast to "au revoir", the French expression for a final parting is "adieu". This is a shortening of of "a Dieu vous comant" ("I commend you to God"). In

In contrast to "au revoir", the French expression for a final parting is "adieu". This is a shortening of of "a Dieu vous comant" ("I commend you to God"). In a sense, this is the opposite of "goodbye", at least in the implied direction of divine intercession.