Moderator

Noun

 * 1) someone who moderates
 * 2) an arbitrator or mediator
 * 3) the chair or president of a meeting etc
 * 4) the person who presides over a synod of a Presbyterian Church
 * 5)  a substance (often water or graphite) used to decrease the speed of fast neutrons in a nuclear reactor and hence increase likelihood of fission
 * 6) a device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.

Thesaurus
JP, Justice, MC, alleviative, alleviator, anchorman, anodyne, arbiter, arbitrator, assuager, balm, bencher, calmative, chair, chairman, conciliator, coordinator, critic, cushion, dolorifuge, emcee, his honor, his lordship, his worship, impartial arbitrator, indicator, judge, justice, lenitive, magistrate, master of ceremonies, mediator, mitigator, modulator, mollifier, negotiator, pacificator, pacifier, palliative, peacemaker, president, presiding officer, referee, restraining hand, salve, sedative, shock absorber, soother, soothing syrup, stabilizer, temperer, third party, toastmaster, tranquilizer, umpire, unbiased observer, wiser head

Etymology
From moderator.

Translations

 * French:
 * Hebrew:


 * Russian: модератор
 * Spanish: moderador, moderadora

Noun

 * 1) moderator