mod·er·a·tor 
/ˈmɑ:dəˌreɪtɚ/ noun
plural mod·er·a·tors /ˈmɑ:dəˌreɪtɚ/ noun [count] : someone who leads a discussion in a group and tells each person when to speak : someone who moderates a meeting or discussion
▪ The moderator allowed audience members to ask the governor questions. ▪ She acts as the moderator in our office meetings.
▪ The moderator allowed audience members to ask the governor questions. ▪ She acts as the moderator in our office meetings.
