LATIN DICTIONARYLexicon Latīnum
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“negotiator” in Latin

The English word negotiator itself goes back to Latin negōtium, through negōtiātor.

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

negotiator
qui de aliqua re agit (general term): internuncius (one who carries messages between two parties): interpres (a mediator, who transacts with another person in the name and by the authority of a third party, with a view to settle differences, etc.; post-Augustan): intercessor (one who interposes in order to hinder or accomplish anything): conciliator alicujus rei (one who brings about an union; e.g., nuptiarum): pactor alicujus rei (one who concludes a bargain).

Quick answer

What is the Latin word for negotiator?
The usual Latin words for “negotiator” are interpres, intercessor, nū̆ptiae. 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.