How many times is biweekly?
Confusion is caused by the fact that biweekly, bimonthly, and biyearly can mean either "once every two weeks (or months or years)" or "twice a week (or month or year)." If you want to avoid doubt, it is better to reword the sentence: The talks are held twice a week at the local school. The talks are held every two weeks at the local school.
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