English word union comes from Proto-Indo-European *oynolos, Proto-Indo-European *yo-, and later Proto-Italic *oinos (One.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *oynolos | Proto-Indo-European (ine) | |
| *yo- | Proto-Indo-European (ine) | |
| *óywos | Proto-Indo-European (ine) | |
| *oinos | Proto-Italic (itc-pro) | One. |
| oinos | Old Latin (itc-ola) | (cardinal) one. |
| unus | Latin (lat) | Alone. One, single (cardinal) one; 1 (Medieval Latin) a, an. |
| unionem | Late Latin (LL) | |
| unionis | Latin (lat) | |
| ūniōnem | Late Latin (LL) | |
| union | Old French (842-ca. 1400) (fro) | Trinity (God, Jesus and the Holy Spirit). |
| union | English (en) | 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 [...] |