LATIN DICTIONARYLexicon Latīnum
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“partner” in Latin

The English word partner itself goes back to Latin pars, through partītiōnem.

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

partner
socius; societate conjunctus: partner in trade, socius consorsque laboris; or simply socius: at cards, *aleae socius et particeps: in crime, crimini affinis, ejus noxae socius, conscius (having a guilty knowledge of it): in fortune, cujuscumque fortunae socius, socia (Vid: Tac., Ann., 3, 5, 1); laborum periculorumque socius, socia (Vid: Cic., ad Div., 13, 71, 2; Tac., Germ., 18, 7): also, from the context, simply socius (socia) comesque (Vid: Hor., Od., 1, 7, 26).

Quick answer

What is the Latin word for partner?
The usual Latin words for “partner” are socius, cōnscius. 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.