au revoir (interj.)

1690s, French, "good-bye for now," literally "to the seeing again." From au "to the" (see au) + revoir "see again, see in turn" (Old French reveoir, 12c.), from Latin revidere, from re- "back, again" (see re-) + videre "to see" (see vision).

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Definitions of au revoir from WordNet

au revoir (n.)
a farewell remark;
Synonyms: adieu / adios / arrivederci / auf wiedersehen / bye / bye-bye / cheerio / good-by / goodby / good-bye / goodbye / good day / sayonara / so long