Webster's English Dictionary

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moderator

mod.er.a.tor \'ma:d-*-.ra-t-*r\ \-.ship\ n 1: one who arbitrates : MEDIATOR 
    2: one who presides over an assembly, meeting, or discussion : as  2a: the 
   presiding officer of a Presbyterian governing body  2b: the nonpartisan 
   presiding officer of a town meeting  2c: the chairman of a discussion group 
    3: a substance (as graphite) used for slowing down neutrons in a nuclear 
   re actor - mod.er.a.tor.ship n