A person appointed or chosen to settle a dispute through compromise or arbitration; an arbiter.
From Old French 'compromissaire,' derived from Latin 'compromissus.' The -ary suffix creates a noun for a person involved in the action. A legal term used primarily in medieval European law.
This wonderfully archaic word shows how medieval legal systems were obsessed with creating precise titles for every role—a 'compromissary' was specifically someone both parties agreed to trust. Modern English just calls them 'arbitrators,' losing the sense that both sides had to give their approval!
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