LATIN DICTIONARYLexicon Latīnum
English → Latin

“ally” in Latin

The English word ally itself goes back to Latin ligō, through alligāre.

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

ally
join one thing to another conjungere aliquid cum aliqua re: adjungere aliquid alicui rei, or ad aliquid (both proper and improper): copulare aliquid cum aliqua re (join fast, unite as if by a band, thong, etc., figuratively): connectere aliquid cum aliqua re (connect as, if by a tie or knot: figuratively, e.g., orientem et occidentem; amicitiam cum voluptate).
Unite or league one’s self with, se jungere, conjungere cum aliquo (join: generally): societatem inire, coire, facere cum aliquo (enter into a company, league, etc.): foedus facere (of an actual alliance): by marriage, matrimonio aliquem secum jungere.
To be allied, foedere conjungi cum aliquo.
= to be akin to, etc. Vid: ALLIED.
Figuratively.
ally
socius: foederatus. To be anybody’s ally, foedere or societate et foedere jungi alicui; socium alicui esse. To procure allies, socios sibi adsciscere.

Quick answer

What is the Latin word for ally?
The usual Latin words for “ally” are coeō, socius, foederō; also foedus. 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.