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moderator

 - 5 dictionary results

mod⋅er⋅a⋅tor

  [mod-uh-rey-ter]
Use moderator in a Sentence
–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; ME < L moderātor, equiv. to moderā(rī) to control (see moderate ) + -tor -tor

Related forms:
mod⋅er⋅a⋅to⋅ri⋅al  [mod-er-uh-tawr-ee-uhl, -tohr-] , adjective
mod⋅er⋅a⋅tor⋅ship, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To moderator
mod·er·a·tor   (mŏd'ə-rā'tər)   
n.  

  1. One that moderates, as:

    1. One that arbitrates or mediates.

    2. One who presides over a meeting, forum, or debate.

  2. The officer who presides over a synod or general assembly of the Presbyterian Church.

  3. Physics A substance, such as water or graphite, that is used in a nuclear reactor to decrease the speed of fast neutrons and increase the likelihood of fission.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

moderator 
1398, "ruler, governor," from L. moderator "manager, ruler, director," lit. "he who moderates," from moderatus (see moderate (adj.)). Meaning "one who acts as an umpire" is from c.1560.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: mod·er·a·tor
Pronunciation: 'mäd-&-"rAt-&r
Function: noun
: a substance (as graphite, deuterium in heavy water,or beryllium) used for slowing down neutrons in a nuclear reactor
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Computing Dictionary

moderator
A person, or small group of people, who manages a moderated mailing list or Usenet newsgroup. Moderators are responsible for determining which email submissions are passed on to the list or newsgroup.

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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