moderator
nounDefinition of moderator
1
: one who arbitrates : mediator
2
: one who presides over an assembly, meeting, or discussion: such 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 (such as graphite) used for slowing neutrons in a nuclear reactor
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