Well, I am English, and I say bi-weekly means twice per week. Wikipedia says biweekly means twice per week in the UK. The dictionaries give both meanings and if you Google bi-weekly, you'll see discussions about whether it means once every two weeks or twice per week.
Just because you say it's one of them, doesn't make it so. That's also true for me as well. We need to wait to get it clarified like I said, as it actually does mean both.
I'm just saying bi = two in every other use (it never means twice), so it stands to reason that it would mean "two weeks" not "twice a week".
Logically speaking, paying a dividend every 2 weeks is more realistic than paying twice a week.