I guess I’m just generalizing semi-weekly from semi-annual. Do people actual my use the term bi-weekly to mean twice a week? I understand confusing bi-annual to mean twice a year because years can be evenly split in two and bi-annual would thus mean every six months. But weeks, being 7 days long, don’t naturally get cut in half. If you heard someone use the phrase bi-weekly and the context implied twice a week, what would that even mean to you? It seems to me that someone would always say the exact days of the week they meant.