n. 25B6; noun ARBITRATOR, arbiter, negotiator, conciliator, peacemaker, go-between, middleman, intermediary, moderator, intervenor, intercessor, broker, honest broker, liaison officer; umpire, referee, adjudicator, judge.
MEDIATOR
Meaning of MEDIATOR in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012