A person who acts as host at a formal event, making the welcoming speech and introducing other speakers.
A performer who conducts a program of varied entertainment by introducing other performers to the audience.
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.