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Latin word unum comes from Proto-Indo-European *yo-, Proto-Indo-European - -nós, Proto-Indo-European *oynolos, and later Proto-Italic *oinos (One.)
*yo- (Proto-Indo-European)
- -nós (Proto-Indo-European)
*oynolos (Proto-Indo-European)
*ínos (Proto-Indo-European)
*oinos (Proto-Italic)
One.
oinos (Old Latin)
(cardinal) one.
unum (Latin)