A person who judges or decides something together with another person as a joint judge or arbiter.
From Latin co- (together) + adjudicator (one who judges). The prefix co- was added to adjudicator in Medieval Latin legal contexts to denote shared judicial authority, evolving from Roman legal tradition where multiple magistrates shared decision-making power.
In ancient Rome, important decisions were deliberately made by multiple officials together—a system designed to prevent any single person from becoming too powerful. This word preserves that brilliant democratic idea!
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