Chair [N.]
Definition:
The presiding officer of a meeting, organization, committee or event.
Different voices easily heats up debate. Opinions in a MUN conference can be as diverse and piercing. Let alone by themselves, delegates representing different countries is very likely to yell at one another for different aspects of the issue, letting the conference out of control. Therefore, a Chairperson (Chair), along with one or more Assistant Chairs sits in front and take full control of MUN conferences. The Chair is authorized to keep the whole committee in order, with help from Assistant Chairs.
Examples:
"Honorable Chair and my distinguished fellow delegates, the delegate of Mexico believes that the proposal made by delegate of Burkina Faso is reasonable enough and worth discussing. Thank you, Chair" the delegate stated at the beginning of his speech.
"The Chair now announces the floor officially open" is a common statement a Chair uses to begin the MUN conference.