- moderator UK US /ˈmɒdəreɪtər/ noun [C]► someone who controls and leads a discussion between a group of people, but does not take any side in it: »
A panel of business people will ask the candidates questions, with a local journalist as moderator.► INTERNET someone who makes sure that the rules of an internet discussion are not broken, for example by removing any threatening or offensive comments: »
She began posting on the message board and was later asked to be a moderator.
Financial and business terms. 2012.