Philosophy seems like an important part of the Architectural education – both Greg Lynn and Joshua Prince-Ramus both have degrees in philosophy (among others, I am sure). It seems to inform some of the best work.
If you are looking for a good source for clarification, when wikipedia just doesn’t cut it – check out the plato server at Stanford. It has a topical index that covers just about anything you want to know – even the things you didn’t know you wanted to know, that is, if we can know…you know?