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n. One who gives a keynote address.

n. A speaker who delivers the keynote speech of a conference.

"JEFF GREENFIELD, CNN SENIOR POLITICAL ANALYST: The only way it could matter is that it -- it is -- it's kind of a throwback to the kind of speeches that were routine at conventions decades ago, when you were -- when the keynoter, which is what Zell Miller was, was supposed to come out and basically beat the other party upside the head."

speaker    keynote