mediator
me·dia·tor
noun
1.
a negotiator who acts as a link between parties
Origin
From Middle English mediatour, mediatoure, mediatur, medyatour, from Middle French mediateur, mediatur or its etymon Latin mediātor (“one who mediates”), from mediātum, supine of mediō (“be in the middle”), from medius (“middle”). By surface analysis, mediate + -or.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.