50 () posted 2 years ago by pkvi 2 years ago by pkvi +52 / -2 6 comments share 6 comments share save hide report block hide replies
Bi means two. Semi means half. Biweekly means every 2 weeks. Semiannually means every half-year.
It's one of those things where morons used it wrong for so long that people gave up trying to correct them.
They both mean the same thing