LATIN DICTIONARYLexicon Latīnum
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“treaty” in Latin

The English word treaty itself goes back to Latin tractātus, through tractāre.

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

treaty
foedus (a public treaty, confirmed by the authority of the Senate and people; also, between two or more individuals): sponsio (a treaty concluded, or a peace made by mutual consent and solemn promise of the generals of armies, but not ratified by the Senate and people of the two belligerent nations; Vid: Liv., 9, 5, in., lion foedere pax Caudina, sed per sponsionem facta est). To make or conclude a treaty with anyone, foedus cum aliquo facere, icere, ferire, percutere; foedus jungere cum aliquo; foedere jungere alicui; foedus inire cum aliquo: to conclude a treaty of marriage [Vid: To MARRY]: I am in treaty with any one, mihi cum aliquo foedus est ictum: to observe a treaty, foedus servare; foedere stare; in fide manere (opposed to foedus negligere; foedus violare, rumpere, frangere foedus violare et frangere).

Quick answer

What is the Latin word for treaty?
The usual Latin words for “treaty” are foedus, spōnsiō, ī̆cō; also feriō, percutiō. 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.