moderator

/ˈmɑdəˌreɪtər/
noun
  1. A person who makes sure a discussion, debate, or online forum follows the rules and stays respectful.
    • The moderator asked everyone to speak one at a time during the debate.
    • Our online forum has a moderator who removes spam comments.
    • The panel moderator introduced each speaker before the discussion.
  2. A person who helps a group reach an agreement or make a decision by guiding the conversation.
    • A skilled moderator can turn a heated argument into a productive conversation.
    • The community moderator listened to both sides before suggesting a compromise.
    • The meeting moderator helped the team decide on a new project plan.
  3. A substance used in nuclear reactors to slow down neutrons.
    • Water is commonly used as a moderator in nuclear reactors.
    • Engineers checked the graphite moderator for any signs of damage.
    • The reactor's moderator helps control the speed of the nuclear reaction.
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