1. a person who leads or controls a discussion, debate, or meeting
2. a person who monitors and controls content on an online forum or social media platform
Usage: internet/technology
3. a substance used to slow down neutrons in a nuclear reactor
Usage: nuclear physics

Examples

• The debate moderator asked each candidate to respond in two minutes.
• She served as moderator for the town hall meeting.
• The forum moderator removed inappropriate posts from the discussion board.
• Online moderators work to keep conversations civil and on-topic.
• The nuclear reactor uses water as a moderator to control the reaction.
• He was chosen as moderator because of his impartial reputation.
• The moderator kept the panel discussion focused and productive.