English dictionary so long meaning and definition Definition and meaning of so long at MeaningMonkey.org. so long meaning and definition in the English Dictionary. SO LONG nounDefinition of so long (noun)a farewell remark"they said their good-byes"synonyms: adieu, adios, arrivederci, au revoir, auf wiedersehen, bye, bye-bye, cheerio, good day, goodby, good-by, goodbye, good-bye, sayonara Source: Princeton University Wordnet
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