Etymology
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ciao (interj.)

parting salutation, 1929, dialectal variant of Italian schiavo "(your obedient) servant," literally "slave," from Medieval Latin sclavus "slave" (see slave (n.)).

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Definitions of ciao

ciao (n.)
an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian);
Synonyms: aloha
From wordnet.princeton.edu