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ciao

/tʃaʊ/

Informal greeting or farewell in Italian

From Proto-Slavic slověnin (Slavic person).

interjection
noun
slověnin
Proto-Slavic
Verified
*slověnin
reconstructed
A Slavic person; the ultimate source of the ethnonym

from Proto-Slavic *slověninъ. Not related to Vietnamese chào (“hello, goodbye”). Doublet of Slav and slave.

Latin
Verified
Sclavus
A Slav; later associated with a slave

from Medieval Latin sclavus "slave" (see slave (n.)).

+1 more source
Medieval Latin
Verified
sclavus
Slave; the semantic shift arose because many Slavs were enslaved in medieval Europe

from Medieval Latin sclavus "slave" (see slave (n.)).

+1 more source
Venetan → Italian
Verified
s-ciavo → ciao
“Your servant” became a humble salutation, shortened to the modern greeting and farewell

from Italian ciao (“hello, goodbye”)

Modern English
ciao

A tiny word with a cheerful sound carries a surprisingly grim medieval history. In Venetian speech, s-ciao or s-ciavo meant “servant” or “slave,” from Medieval Latin sclavus, a term connected with Slavic people who were frequently enslaved in medieval Europe. By the early twentieth century, the phrase had softened into a friendly gesture of humility—roughly “your servant”—and ciao was recorded in English as a parting salutation in 1929. Then Italian speakers gave the word a useful double life: it can open a conversation or end one. So when you say ciao, you are offering neither merely hello nor merely goodbye, but the polished descendant of an old promise to be someone’s servant.

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