Which neatly brings us back to my question, when does common usage overrule incorrect usage? All dictionaries now acknowledge the common usage of enormity, there's a quite clear etymological path for one to segue to the other for instance, and I'm already prepared to accept defeat on trope even though that's a very recent import from the states. Ooh there's another, I'm seeing segway instead of segue a fair bit recently, that really bring on the wet clowns mantra