Moderator

Alternative forms

• moderatour obsolete

Origin

From Latin moderator.

Full definition of moderator

Noun

1. someone who moderates
• WaltonAngling was ... a moderator of passions.
1. an arbitrator or mediator
2. the chair or president of a meeting etc.
2. the person who presides over a synod of a Presbyterian Church
3. (physics) 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. a device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.
5. (UK) An examiner at Oxford and Cambridge universities.
6. (Ireland) At the University of Dublin, either the first (senior) or second (junior) in rank in an examination for the degree of Bachelor of Arts.
7. A mechanical arrangement for regulating motion in a machine, or producing equality of effect.