Definition of moderators:
(n) :
(Internet) A person who enforces the rules of a discussion forum by deleting posts, banning users, etc.
(n) :
Someone who moderates.
(n) :
An arbitrator or mediator.
(n) :
The chair or president of a meeting, etc.
(n) :
(nuclear 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.
(n) :
A device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.