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say it: AHR-bi-tray-tur
arbitrator is a noun meaning "someone chosen to judge and decide a disputed issue". It carries one recorded sense.
someone chosen to judge and decide a disputed issue
“the critic was considered to be an arbiter of modern literature”
“the arbitrator's authority derived from the consent of the disputants”
“an umpire was appointed to settle the tax case”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for arbitrator come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.