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English word union comes from Proto-Indo-European *oynolos, Proto-Indo-European *yo-, and later Proto-Italic *oinos (One.)
*oynolos (Proto-Indo-European)
*yo- (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.
unionem (Late Latin)
unionis (Latin)
ūniōnem (Late Latin)
union (Old French)
Trinity (God, Jesus and the Holy Spirit).
union (English)
To combine sets using the union operation. (countable) A joint or other connection uniting parts of machinery, such as pipes.. (countable) A trade union; a workers' union.. (countable) An association of students at a university for social and/or political purposes; also in some cases a debating body.. (countable) That which is united, or made one; something formed by a combination or [...]