Look at RCKen and Minnflyer's new site.... the definitions may not be as detailed as you are looking for, but they are correct. Here: [link=http://www.gettingairborne.com/index.html]Getting Airborne[/link]
A true scale airplane is very detailed and has the same dimensional proportions as it's full scale counterpart. Scale modelling takes a lot of care and is best done by a pefectionist who has the patience to do all the fine detail work. Alot of warbirds can be lumped into this category as well.