moderator >> ˈmɒdəreɪtə
Definition: [noun] an arbitrator or mediator.
Example: Egypt managed to assert its role as a regional moderator
Definition: [noun] a person who reviews examination papers to ensure consistency, or otherwise oversees an examination.
Example: after marking by the tutor, the papers are returned to a moderator
Definition: [noun] a person who moderates an internet forum or online discussion.
Definition: [noun] a substance used in a nuclear reactor to retard neutrons.
Example: in a fast reactor there is no moderator to slow the reaction down