mediator

The story

1. Latin · derived frommediātor“one who mediates”
2. Middle French · derived frommediateur, mediatur
3. Middle English · inherited frommediatour, mediatoure, mediatur, medyatour
4. English todaymediator

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.