Main Entry:

mod·er·a·tor

Pronunciation:

\ˈmä-də-ˌrā-tər\

Function:

noun

Date:

circa 1560

1: one who arbitrates : mediator2: one who presides over an assembly, meeting, or discussion: as a: the presiding officer of a Presbyterian governing body b: the nonpartisan presiding officer of a town meeting c: the chairman of a discussion group 3: a substance (as graphite) used for slowing neutrons in a nuclear reactor

— mod·er·a·tor·ship \-ˌship\ noun