Re-education

I have not read anyone else's definition of this word because I don't want to be influenced by what other people think. But I am sure that my definition of it will be similar to what most people have typed because I think it is a very basic term. My understanding of it is pretty straightforward, simply to re-educate someone. By that I mean to teach someone what they already know but maybe have forgotten since. Maybe it is in a different context, maybe it is with a different method. But what it comes down to I believe it to be teaching again material that one has already taught.