OTOH, were it not for bad Latin speakers, we wouldn't have the Romance languages. A John Simon/William Safire of the era is an important source of data on their development--he wrote a list of proper Latin terms and the corresponding words in the bad Latin he was seeing and/or hearing. Dang it, it's not caballus, it's equus!
So you're saying that when I correct someone publicly, I'm not being an insufferable pedant, I'm contemporaneously documenting usage for future linguists!
Ooh, I'm gonna get so much mileage out of that one.
While it has meant both every two weeks and twice a week for a long time, this is an interesting case where convincing people otherwise would pretty clearly improve our language. Even the page you linked to implies this:
> The ambiguous usage is confusing, and might be avoided by the use of semi-