What does it mean to be educated?

I have always thought that being educated meant going to elementary school, middle school, and high school, and graduating from high school and going on to college getting a college degree. I have also thought that someone who goes through elementary and middle school but maybe drops out of high school is still educated but just not as educated as someone who graduates from high school and goes on to college. But why is that the case? I think that everyone has just been told that that is what it means to be educated but who decided that? I have no idea and after thinking about it I do not necessarily think that there is any criteria to being educated. Or if there is then there is a huge difference between being educated and being intelligent.