Borrowed from Italian ciao ("hello, goodbye"), from Venetian ciao ("hello, goodbye, your (humble) servant"), from Venetian s-ciao / s-ciavo, from Medieval Latin sclavus ("Slav, slave"), related also to Italian schiavo, English Slav, slave and Old Venetian S-ciavón ("Slav"), from Latin Sclavonia ("Slavonia"). Not related to Vietnamese chào ("hello, goodbye").
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