[] a keynote speech, speaker, etc. is an important one that introduces a meeting or its subject主题发言；主要发言人◆Steve Dobbs will deliver the keynote address at the conference.史蒂夫 • 多布斯将在会议上作主题演说。▸ˈkeynoter
noun
[] ◆She is known as a dynamic keynoter and business consultant.她获公认为精力充沛的主要发言人和商务顾问。