MODERATOR
moderator
(noun) someone who mediates disputes and attempts to avoid violence
moderator
(noun) someone who presides over a forum or debate
moderator
(noun) in the Presbyterian church, the officer who presides over a synod or general assembly
moderator
(noun) any substance used to slow down neutrons in nuclear reactors
Source: WordNet® 3.1
Etymology
Noun
moderator (plural moderators)
someone who moderates
an arbitrator or mediator
the chair or president of a meeting etc.
(Internet) A person who enforces the rules of a discussion forum by deleting posts, banning users, etc.
Synonym: mod
the person who presides over a synod of a Presbyterian Church
(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
a device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.
(UK) An examiner at Oxford and Cambridge universities.
(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.
(UK) someone who supervises and monitors the setting and marking of examinations by different people to ensure consistency of standards.
A mechanical arrangement for regulating motion in a machine, or producing equality of effect.
(historical) A kind of lamp in which the flow of the oil to the wick is regulated.
Source: Wiktionary
Mod"er*a`tor, n. Etym: [L.: cf. F. modérateur.]
1. One who, or that which, moderates, restrains, or pacifies. Sir W.
Raleigh.
Angling was ... a moderator of passions. Walton.
2. The officer who presides over an assembly to preserve order,
propose questions, regulate the proceedings, and declare the votes.
3. 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. A mechamical arrangement for regulating motion in a machine, or
producing equality of effect.
Source: Webster’s Unabridged Dictionary 1913 Edition