LATIN DICTIONARYLexicon Latīnum
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“mediator” in Latin

The English word mediator itself goes back to Latin medius, through mediātor.

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

mediator
intercessor, qui intercedit (general term, one who comes between, either to hinder or to promote anything; hence, especially an agent, etc.): qui se or auctoritatem suam interponit (one who interferes by virtue of his character or office): arbiter, qui arbitri partes agit or sustinet (umpire or arbitrator): interpres (interpreter and agent, one who negotiates on behalf of another; ☞ orator is the spokesman of an embassy): conciliator alicujus rei (one who effects or accomplishes; e.g., conciliator nuptiarum): ☞ quasi media quaedam manus (Quint., 11, 2, 3) can be used only where a thing is transmitted through a third hand (PROP. and figuratively).

Quick answer

What is the Latin word for mediator?
The usual Latin words for “mediator” are arbiter, sustineō, interpres. 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.