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English word unique comes from Proto-Indo-European *yo-, Latin -icum, Proto-Indo-European *oynolos, and later Proto-Italic *oinos (One.)
*yo- (Proto-Indo-European)
-icum (Latin)
*oynolos (Proto-Indo-European)
*óywos (Proto-Indo-European)
*oinos (Proto-Italic)
One.
oinos (Old Latin)
(cardinal) one.
unus (Latin)
Alone. One, single (cardinal) one; 1 (Medieval Latin) a, an.
unicus (Latin)
Only, sole, single. Uncommon. Unique.
unique (French)
Only. Unique.
unique (English)
(proscribed) Of a rare quality, unusual.. (uncomparable) Being the only one of its kind; unequaled, unparalleled or unmatched.. Of a feature, such that only one holder has it.. Particular, characteristic. A thing without a like; something unequalled or unparallelled.