[Uh oh ... where's he going with this?]

I've had enough.  From now on, everyone must adapt the following language changes: 

1. Biweekly means twice a week.
2. Bimonthly means twice a month.  (Who would use bimonthly to mean every other month?  I mean, honestly, who?!)
3. Biyearly means twice a year.  Semiannually is also acceptable.

Forget everything else you know about these words.  Do as I say.  I've finally settled the "usage problem" with the prefix bi-.