Forum:Is using "First Doctor", "Second Doctor" etc in-universe?

Are the terms "First Doctor", "Second Doctor" etc not out of universe? I've noticed on many pages that these types of names are used. Since these pages are supposed to be in-universe and these terms are out-of-universe, they shouldn't be used should they? The terms "first incarnation" etc should be used, shouldn't they? The Thirteenth Doctor 18:25, July 30, 2010 (UTC)