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moderator

[mod-uh-rey-ter] /ˈmɒd əˌreɪ tər/
noun
1.
a person or thing that moderates.
2.
a person who presides over a panel discussion on radio or television.
3.
a presiding officer, as at a public forum, a legislative body, or an ecclesiastical body in the Presbyterian Church.
4.
Physics. a substance, as graphite or heavy water, used to slow neutrons to speeds at which they are more efficient in causing fission.
Origin
1350-1400
1350-1400; Middle English < Latin moderātor, equivalent to moderā() to control (see moderate) + -tor -tor
Related forms
moderatorial
[mod-er-uh-tawr-ee-uh l, -tohr-] /ˌmɒd ər əˈtɔr i əl, -ˈtoʊr-/ (Show IPA),
adjective
moderatorship, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for moderator ship

moderator

/ˈmɒdəˌreɪtə/
noun
1.
a person or thing that moderates
2.
(Presbyterian Church) a minister appointed to preside over a Church court, synod, or general assembly
3.
a presiding officer at a public or legislative assembly
4.
a material, such as heavy water or graphite, used for slowing down neutrons in the cores of nuclear reactors so that they have more chance of inducing nuclear fission
5.
an examiner at Oxford or Cambridge Universities in first public examinations
6.
(in Britain and New Zealand) one who is responsible for consistency of standards in the grading of some educational assessments
7.
a person who monitors the conversations in an on-line chatroom for bad language, inappropriate content, etc
Derived Forms
moderatorship, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for moderator ship

moderator

n.

late 14c., "ruler, governor," from Latin moderator "manager, ruler, director," literally "he who moderates," from moderatus (see moderate (adj.)). Meaning "one who acts as an umpire" is from 1560s. Fem. form moderatrix attested from 1530s.

Online Etymology Dictionary, © 2010 Douglas Harper
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moderator ship in Science
moderator
  (mŏd'ə-rā'tər)   
A substance, such as graphite, water, or heavy water, placed in a nuclear reactor to slow neutrons down to speeds at which they are more likely to be captured by fissionable components of a fuel (such as uranium-235) and less likely to be absorbed by nonfissionable components of a fuel (such as uranium-238). Also called neutron moderator. See also slow neutron.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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