LATIN DICTIONARYLexicon Latīnum
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“arbitration” in Latin

The English word arbitration itself goes back to Latin arbiter, through arbitratio.

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

arbitration
arbitrium. To refuse anybody’s arbitration, arbitrum or disceptatorem aliquem recusare. To commit anything to any body’s arbitration, rem alicujus arbitrio permittere: to the arbitration of the sword, controversiam ferro dijudicare, decernere, disceptare.
Decision, dijudicatio, disceptatio (as action): judicium, sententia (judical sentence).

Quick answer

What is the Latin word for arbitration?
The usual Latin words for “arbitration” are arbitrium, dījūdicātiō, disceptātiō; also iūdicium, sententia, arbiter. 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.