n.
Pronunciation: ' mä-d ə - ˌ r ā -t ə r
Function: noun
Date: circa 1560
1 : one who arbitrates : MEDIATOR
2 : one who presides over an assembly, meeting, or discussion: as a : the presiding officer of a Presbyterian governing body b : the nonpartisan presiding officer of a town meeting c : the chairman of a discussion group
3 : a substance (as graphite) used for slowing neutrons in a nuclear reactor
– mod · er · a · tor · ship \ - ˌ ship \ noun