This type of employee is not unusual and if not handled appropriately it can be a deterrent for others to speak in the meeting. I usually have some formality with my meetings. The Chair calls on people when they have something to say. Importance to any meeting is to stay on task. If the contributor is off task then I will call their attention to being off subject and explain we will stay on topic for the sake of the meeting time management to accomplish set goals. If they would like to put it on a future agenda or even discuss it with me after the meeting I will be available. When you have heard enough from an employee and you get the idea it important to move on by just explaining we have a time schedule for the meeting and we need to hear from others. (Thank you for your input)