This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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interjection. Used to express an acknowledgment of parting.

n. An acknowledgment at parting, especially by saying "goodbye.”

n. An act of parting or leave-taking: many sad goodbyes.

interjection. farewell; a formula used to another person or persons when the speaker or writer or person addressed is departing.

n. An utterance of goodbye, the wishing of farewell to someone.

n. a farewell remark

"Drop points here, though, and the Frenchman can kiss the title goodbye on both cheeks."

farewell    word of farewell   

toodle pip    adios    good evening    cheerio    ciao    TTFN    good night    good eve    farewell    bye-bye   

Ai    Alai    Ally    Bi    Bligh    Bly    Brunei    Cai    Cy    Dai   

good-bye    farewell    goodnight    good-morning    greeting    leave-taking    curtsy    rejoinder