noun
a person who presides over a meeting or discussion, ensuring that each participant has a chance to speak and that the meeting runs smoothly
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The moderator of the conference ensured that each speaker adhered to their allotted time.
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The moderator at the event kept things running smoothly.
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The mod did a great job of keeping the chat under control.
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She acted as the moderator of the group, always stepping in to mediate disagreements.