a person who arbitrates; a mediator
a person who presides over an assembly, meeting, debate, etc, e.g. the presiding officer of a Presbyterian governing body
a person who presides over an assembly, meeting, debate, etc, e.g.:
the presiding officer of a Presbyterian governing body
the officer presiding over certain Oxbridge examinations
a person who moderates examination papers or results
in physics, a substance used for slowing down neutrons in a nuclear reactor
moderatorship noun