Commentary: MEDIATOR[+person][+intermediary][+conflict] [+role][+arbitrator]
France has also sent a mediator to the negotiations.
The couple decided to use a mediator to settle their divorce out of court.
WordNet 3.0 Sense Numbers: 1
Commentary: MEDIATOR[+substance][+chemical] [+role][+agent][+instigator][+response]
Histamine and heparin are allergy mediators released by mast cells in contact with an allergen.
There is some unknown biochemical mediator involved in this cell response.
WordNet 0.0 Sense Numbers: 2