Graham Berrisford has set aside part of his website with a project to create a Glossary of Terms for Enterprise and Solution Architects.
I think this is a simple and fantastic idea as discovering what words and acronyms mean is actually a pain in the neck. Yes, Wikipedia is great but sometimes a simple sentence rather than a full page of explanation is all that is required. Also, acronyms like 'MDA' have several meanings depending on context so it is handy to have a resource that is from the Architects point of view.
The resource is free and open to anybody to suggest changes.