LATIN DICTIONARYLexicon Latīnum
English → Latin

“union” in Latin

The English word union itself goes back to Latin oinos, through ūniō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

union
The uniting, junctio: conjunctio: congregatio: consociatio. [SYN. in JOIN].
United body, societas (body united for a common purpose; society): concursus (the coming together of things; e.g., honestissimorum studiorum): conjunctio (the joining, assemblage; of things).

Quick answer

What is the Latin word for union?
The usual Latin words for “union” are iūnctiō, coniūnctiō, congregātiō; also cōnsociātiō, societās, concurrō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.