- One that arbitrates or mediates.
- One who presides over a meeting, forum, or debate.
- A person who presides at a town meeting, debate, assembly, etc.
- The presiding officer of a governing body, as of the Presbyterian Church.
- A substance, as graphite or heavy water, used to slow down high-energy neutrons in a nuclear reactor.
Other Word Forms
Origin of moderator
- From Latin moderator.