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“negotiation” in Latin

The English word negotiation itself goes back to Latin negōtium, through negotiatio.

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

negotiation
actio, de aliqua re; colloquium (conference): Often by circumlocution with the verb. To enter into a negotiation respecting anything, postulare conditiones de aliqua re: to carry on a negotiation, conditiones ferre et audire; conditiones agitare, tractare, agere cum aliquo: to break off a negotiation for peace, infecta pace dimittere legatos; dimittere pacis internuncios; conditiones de pace ineunda propositas dirimere, abrumpere: during these negotiations, dum haec aguntur (Liv.): to settle by negotiation, conditionibus disceptare aliquid; per colloquium aliquid componere.

Quick answer

What is the Latin word for negotiation?
The usual Latin words for “negotiation” are āctiō, colloquium, tractō; also abrumpō. 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.