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Latin word unus comes from Proto-Indo-European *yo-, Proto-Indo-European - -nós, and later Proto-Indo-European *óynos (One. Single.)
*yo- (Proto-Indo-European)
- -nós (Proto-Indo-European)
*óynos (Proto-Indo-European)
One. Single.
*oinos (Proto-Italic)
One.
oinos (Old Latin)
(cardinal) one.
unus (Latin)
Alone. One, single (cardinal) one; 1 (Medieval Latin) a, an.