arbiternoun · Level 1 SAT1a person with power to decide a dispute; judgeThe retired judge served as arbiter in the labor dispute, and both sides agreed to honor the ruling.ModuleLevel 1Registerargument, common, literaryCollectionCollection 047SAT Core planAlso in Collection 047anonymous, accessible, archaic, arid, extraneous, fragile, invective, ominous and 1 more