Princeton's WordNet

1. moderator(noun)

   any substance used to slow down neutrons in nuclear reactors

2. moderator(noun)

   in the Presbyterian church, the officer who presides over a synod or general assembly

3. moderator(noun)

   someone who presides over a forum or debate

4. moderator(noun)

   someone who mediates disputes and attempts to avoid violence

Wiktionary

1. moderator(Noun)

   someone who moderates

2. moderator(Noun)

   the person who presides over a synod of a Presbyterian Church

3. moderator(Noun)

   a substance (often water or graphite) used to decrease the speed of fast neutrons in a nuclear reactor and hence increase likelihood of fission

4. moderator(Noun)

   a device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.

Origin: From moderator.

Webster Dictionary

1. Moderator(noun)

   one who, or that which, moderates, restrains, or pacifies

2. Moderator(noun)

   the officer who presides over an assembly to preserve order, propose questions, regulate the proceedings, and declare the votes

3. Moderator(noun)

   in the University of Oxford, an examiner for moderations; at Cambridge, the superintendant of examinations for degrees; at Dublin, either the first (senior) or second (junior) in rank in an examination for the degree of Bachelor of Arts

4. Moderator(noun)

   a mechamical arrangement for regulating motion in a machine, or producing equality of effect

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