in·ter·ces·sor \ˈ ̷ ̷ ̷ ̷ˌsesə(r)\noun (-s) Etymology: Middle English intercessour, from Middle French & Latin; Middle French intercesseur, from Latin intercessor, from intercessus (past participle) + -or 1.: one who intercedes : mediator 2.: a bishop who during a vacancy of the see administers the bishopric till a successor is installed