What does biweekly actually mean?

I always thought biweekly meant twice a week and when people mean every other week, they should say bimonthly. Bi meaning 2 or twice and then the time frame. I looked this up online and the two definitions are: http://www.merriam-webster.com/dictionary/biweekly 1 : occurring twice a week 2 : occurring every... show more I always thought biweekly meant twice a week and when people mean every other week, they should say bimonthly. Bi meaning 2 or twice and then the time frame.

I looked this up online and the two definitions are: http://www.merriam-webster.com/dictionar...

1 : occurring twice a week
2 : occurring every two weeks : fortnightly

Pretty ambiguous right?

I've been told twice a week should be semi-weekly. What gives?
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