I believe the purpose of education is to open the minds of those receptive to knowledge. To arm individuals with the information necessary to form their own beliefs and opinions. To gain perspective and understanding of the world in which we live.
Though there are different facets of intelligence (social, emotional, etc.), in a traditional sense I believe an educated person is someone who acts on logic. Someone who can see multiple points of view. An educated person spends time collecting facts before forming judgments or opinions.