Educational but I think some of these proscriptions are a little stodgy. For example, I know what "alibi" really means but the usage of the word has expanded to

Educational but I think some of these proscriptions are a little stodgy. For example, I know what "alibi" really means but the usage of the word has expanded to conveniently include more explanations than only proven ones, because it is typically used in situations of alleged guilt over some crime.